Meng Qiaoyu was a little puzzled.

He and Lin Sitian were sitting at the desk doing their homework. On the phone holder in front of them was a phone with a video call turned on. The person on the phone had a pale face and was also doing his homework silently.

He leaned close to Lin Sitian's ear and whispered, "Do I have to burn incense for others to do my homework? Aww——"

Lin Sitian stepped on him hard.

Zhou Sheng on the other end of the video looked up and cleared his throat before speaking, suppressing the sound of a cough. [So it doesn’t have to be so complicated.]

Accompanied by occasional coughing, he then sorted out the ideas that Meng Qiaoyu had just taught Lin Sitian, and then came up with his own solution. His solution was obviously more suitable for Lin Sitian, simple and direct, and his way of thinking in explaining the problem was not affected by his illness at all. It was clear and logical, and Lin Sitian quickly understood it.

Meng Qiaoyu was a little unconvinced.

He knew that this guy was Lin Sitian's desk mate. He had heard before that Lin Sitian was dating him, but later Yang Xuelin from their class told him that it was a rumor. Looking at it now, could they be considered as study partners?

"Then...what about the question about conic sections?" Lin Sitian took a look at the test paper.

"Which question?" [Which question?] Two voices asked in unison.

Lin Sitian touched her nose, glanced at the phone and the two people beside her who were looking at her questioningly, "... Just the eighth question? I don't know if my current answer is correct."

"Let me see it." Meng Qiaoyu was quick-witted and took it.

In the video, Zhou Sheng could only watch him approach Lin Sitian, take the test paper, and the paper he held up just blocked the picture of the two of them.

"Oh, actually, we know that point P is on the parabola C. Suppose the slope of PA is k. What you are looking for here is..." Meng Qiaoyu's voice came from behind the paper.

Zhou Sheng stared at the screen of his mobile phone, feeling depressed. Although Lin Sitian took a picture of the test paper for him to do at the beginning, he couldn't help her analyze it without the answers written by Lin Sitian, and he couldn't get a word in at all. At this moment, Meng Qiaoyu was explaining to her, and it would be a bit rude to interrupt suddenly.

Thinking about the end of the test, Meng Qiaoyu became her deskmate and sat so close to her.

Zhou Sheng's hand holding the pen scribbled unconsciously.

Stroke by stroke, on paper, in mind, circles randomly.

Whether it was intentional or not, the test paper still blocked the screen of the phone. Meng Qiaoyu continued to talk to Lin Sitian while holding the test paper: "If we substitute the answer into the equation at this time, it should be x2 plus 2kx minus..." Meng Qiaoyu picked up the pen.

[2XA=-4(k+1). ] Zhou Sheng’s calm voice came from the video.

"Ah?" Meng Qiaoyu had just written down the equation when the result was given. He suddenly put down the paper and looked at Zhou Sheng.

[Vieta's Theorem.] Zhou Sheng said calmly, and then he coughed again because of the sore throat.

Zhou Sheng quickly went through the questions at first, and spent the rest of the time listening to Meng Qiaoyu talk without even looking at the questions.

I also thought about some random things.

When he came to his senses, he found that the key points of the question he had written down had been scribbled over by his pencil.

[PA and PB have complementary inclination angles…] Zhou Sheng felt his throat itchy, frowned, and his eyes fell on the handwriting that he had smeared into a mess, [PB’s slope is -k.]

When I touched it with my fingertips, I felt that the clean fingertips were stained with a trace of lead and were no longer flawless.

[The answer is 2. According to your previous analysis, Lin Sitian’s solution should be correct.]

"My answer is 2!" Lin Sitian clapped her hands, "Zhou Sheng, I did it right! Praise me! Praise me!"

At this time, Meng Qiaoyu raised his eyebrows and looked at his mobile phone, then turned to the ecstatic Lin Sitian - didn't she say that she had no interest in mathematics?

[Yeah.] Zhou Sheng couldn't help laughing, even though he wasn't in high spirits, he still cooperated and praised her, [You're amazing.]

What is this... a primary school education tutoring site? Meng Qiaoyu was a little unbelievable.

Lin Sitian bit her lip and smiled very proudly.

Outside the screen, Zhou Sheng rubbed his fingers, and the mark spread even wider.

Perhaps it was the man's competitive spirit that was at work, as Meng Qiaoyu took priority over every question thereafter. This time he had experience and did not repeat the answers written by Lin Sitian. Zhou Sheng, who was at a disadvantage off the court, was powerless with his brain and could only occasionally remind Meng Qiaoyu "let me see" before he spoke.

But he spoke too quickly and coughed non-stop. Lin Sitian even advised him worriedly: "Forget it, Zhou Sheng, stop thinking about the questions. I know you can do them. There's no need. Go and have a rest."

It is necessary, of course it is necessary. Now he just wants Lin Sitian to finish the questions quickly and let that guy go.

"Meng Qiaoyu, give it back to me! I don't want you to see that!"

"57 points? Lin Sitian, when did you take this test?"

"Give it back to me! I just put it on the edge of the table, don't move!"

Zhou Sheng, the sickly boy, was still in a daze at the moment. He heard a noisy sound from the other side of the phone. When he rubbed his temple and looked up, there was already a commotion over there. Meng Qiaoyu was like the bad boy in his childhood who was tall and would hold things above his head to prevent others from taking them. He easily blocked Lin Sitian with one hand and reviewed the old test paper with the other hand. Lin Sitian was so angry that she rushed forward to grab it, but he dodged flexibly.

During the argument, Lin Sitian's hand hit the phone holder, and with two "click" and "beep" sounds, the call was hung up.

Zhou Sheng stared at the phone screen that had returned to the chat interface for a long time, but the other party did not call.

Later, Zhou Sheng finally couldn't hold back and sent a video invitation, but Lin Sitian didn't accept it.

He could only wait for Lin Sitian to call him.

[I have finished my homework.] After a long time, Lin Sitian sent a message.

Zhou Sheng stared at the line of words, feeling uncomfortable.

Did that person explain the problem to you? — He did not reply until a long while later.

[On my own! Meng Qiaoyu went back early.]

[You should go to bed early today and don’t worry about my test paper. I will ask the teacher if I have any questions tomorrow.]

[Good night.]

Zhou Sheng leaned back in his chair, put his hands to cover his eyes, and coughed incoherently again.

So annoying.

It was almost 11 o'clock and Lin Sitian had almost fallen asleep, when suddenly a vibration woke her up.

After groping around the bedside for a while, she brought the phone to her eyes and yawned.

Then my heart started beating wildly.

It’s Zhou Sheng.

Zhou Sheng actually called him in the middle of the night. At this time, it was no wonder that she was overthinking. Maybe he was not used to not seeing him today? Maybe he couldn't help but think of the madness they had in the classroom yesterday afternoon? Or maybe, Meng Qiaoyu came to her house tonight, and he finally felt a sense of crisis? Before she answered the phone, Lin Sitian had already gone through all the possibilities she could think of in her mind. Any one of them would do. She was so nervous when she received Zhou Sheng's call at this time.

He was so sick today. After she chased Meng Qiaoyu away, she wanted him to have a good rest, so she didn't call back. She finished her homework by herself and didn't even accept his video invitation. If she had known that he was still awake so late, she might as well...

Lin Sitian cleared her throat and answered the call in a half lazy and half gentle voice: "Hello?"

[…Uh, it’s me.]

Of course I know it’s you, this is QQ voice.

[Lin Sitian, today Meng Qiaoyu...]

Choose 3! The correct answer is 3! He felt a sense of crisis! Lin Sitian exhaled lightly: "What happened to Meng Qiaoyu?"

[I thought about it for a moment. The method Meng Qiaoyu taught you for the proof question in Paper B today is not very good. I have a better solution than him——]

Lin Sitian cursed and hung up the phone. On the day of the midterm exam, Lin Sitian finally saw Zhou Sheng after three days of "no see".

She and Zhou Sheng had been at odds these past few days, and she hadn't sent him a single message. Zhou Sheng did ask her how she was preparing for the exam, but she ignored him. She really couldn't understand how a man who had lived for seventeen years could be so absorbed in the sea of ​​exam papers - other people's peacocks could open their tails to produce colorful feathers, but Zhou Sheng could open his tail to produce 108 sets of Hengshui Golden Exam Papers, so he could just sit there and do it to death.

Oh, if he really died of the test paper, he would probably hang a sign at the door: Do Not Disturb.

Lin Sitian felt even more aggrieved when she thought of this, and she glared at the innocent Zhou Sheng.

Zhou Sheng had just sat down when he sensed her gaze and glanced at her sideways to express his doubts.

Lin Sitian turned away hurriedly.

"Good morning." He greeted her proactively, seemingly unaware of Lin Sitian's distant behavior over the past few days.

"……morning."

"These few days——"

"I reviewed and didn't slack off." Lin Sitian guessed that he would ask about her preparations for the exam, so she decided to answer quickly. "Don't worry, I will definitely pass this time."

Zhou Sheng nodded, "Actually, I wanted to ask you how you've been these past few days."

Oh, that's rare.

"I have something for you." Zhou Sheng thought for a moment and lowered his head to search in his schoolbag.

Lin Sitian was stunned. He actually wanted to give her a gift on his own initiative?

No, be alert. She should think carefully first. Is it the five-three test, the real test paper or the Hengshui test paper?

Looking at Zhou Sheng's empty hand that he took out from his bag, Lin Sitian secretly breathed a sigh of relief.

Fortunately, it was not a tutorial book or a test paper.

Zhou Sheng opened his palm, and saw a small black and yellow plastic part that looked like a circuit board. To sum it up in four words by Lin Sitian - extremely ugly.

"What's this?"

"Flashlight," Zhou Sheng's seemingly calm eyes sparkled, and his tone revealed a hint of detachment, "But you can use it as a keychain, it can also be used as a bottle opener, and you can use it as a mobile phone holder if you want."

After he finished speaking, he showed it to Lin Sitian very considerately, "Look, if you bend it like this, it will stand up."

“…”

"In fact, the most important thing is the function of the flashlight. It is a high-intensity flashlight with 30 high-performance COB wicks. It can illuminate an area of ​​30 square meters and has a light intensity of 500 lumens..." Well, he also demonstrated it, and it almost blinded Lin Sitian in the eyes in broad daylight.

6.

The Arabic numerals above represent Lin Sitian's psychological activities. At this moment, Lin Sitian remembered the fear of being dominated by "I gave it as a birthday present, and my girlfriend was so moved that she cried."

But Zhou Sheng was not joking. He handed the keychain to Lin Sitian seriously and said, "I thought that there are no street lights on the road where you live. It would be better to have it if you walk at night."

Lin Sitian was originally shocked speechless by this ugly yet refreshing gift, but Zhou Sheng's last words saved his face a little. Lin Sitian stared at the flashlight keychain in her palm and suddenly felt that it was not so ugly.

After all, this was a gift Zhou Sheng had specially prepared for her out of concern for her safety.

"Thank you." Lin Sitian put it in her pocket and looked up at Zhou Sheng. He looked much better after not seeing him for a few days. Although his face was still as pale as if he had just recovered from a serious illness, it added a touch of delicate scholarly air to him, which matched his brain filled with books.

If only he could have room for her in his mind. After so many intimate actions before, it had come to that point, but he still seemed to be forced to move forward. He was complacent on the surface, but his mind was full of questions. How long would this situation last?

"Zhou Sheng, this thing can't be considered my reward."

She suddenly wanted to try again.

Zhou Sheng was just taking out a pen for the exam and was startled when he heard this: "Huh? I didn't say it was a reward."

"I want to say..." Lin Sitian leaned on the table and spoke softly, so that only two people could hear, "Then little teacher, if I pass the exam this time, can you give me a reward?"

Zhou Sheng looked at her. For some reason, his heartbeat slowed down a little when he mentioned the word "reward".

"All subjects?" Zhou Sheng rubbed his sore neck and turned away from Lin Sitian's gaze.

"Do I have to take all the subjects?" Lin Sitian asked more and more aggrieved, "It's so difficult."

"That……"

"That's a deal," she said suddenly.

"?"