4. 学生们不得不回到教室做作业。

The students go to the classroom and did their exercises.

3. 他经常向我抱怨有太多的作业。

He often me  homework.

2. 在东汉时期，蔡伦发现了造纸的新方法，然后人们开始用纸制作风筝。

In the Han , Cai Lun a new make paper,and then people started to make  paper.

1. John决定单独进人森林。

John  the forest .

10. My father told me that the light (travel) faster than the sound.

9. You look tired,my dear. I think you should stop (work) and sleep for a while.

7. I'm sure you (pass) the exam.

8. I think Wu Bin (practise) volleyball on the playground at the moment.

6. Didn’t you see that under the table (be) three pieces of cake?

5. What you (complain) about to the manager just now?

3. —When she (get) here? --In three hours.

4. He left the office after (lock) the door.