1. My parents usually go to work very early.

2. There is a computer in the middle of the room.

3. Nam must leave to tidy his room every day.

4. Nga is going to have a holiday in Dalat next summer.

5. Lan isn't well enough to go to school today.

6. Boys and girls, you'll have to do this experiment yourself this afternoon.

7. We must put all the small objects such as beads out of children's reach.

8. You are too thin. You ought to eat much more meat.

9. I and my pen friend visited Ho Chi Minh's Mausoleum last Sunday.

10. Let us go to the school’s library next Monday.

11. Peter doesn't talk much in public. He's rather reserved.

12. You must not let children play in the street because it is dangerous.

13. He'll come over to pick you up.

14. The sun always rises in the East and sets in the West.

15. He spends most of his time doing charity work.