20. What are you supposed to do? Do you know?(合并为一句话)
Do you know__________  ___________  ________  ______ to do?

19. Parents should let their children know some good manners.(改为同义句)
Parents________  __________ ________ let their children know some good manners.

18. You are supposed to be there at 6： 00.(对画线部分提问）
                     I      to be there?

17. Would you drop in at my house when you are in town?(改为同义句)
Would you_________  _________  ________ my house when you are in town?

16. Its important for us to spend time with family and friends.(改为同义句)

                time with family and friends      important to us.

(   ) 15. The bowl is full of water. Will you please      it?

A. make    B. change C. take    D. empty

(   ) 14. In Brazil, you should wipe your mouth      your napkin every time you take a drink.

A. for    B. on C. with    D. in

(   ) 13. Please keep quiet. If you make a lot of       you may disturb others.

A. sound    B. voice C. noise    D. singing

(   ) 12.________ is impolite to stick your chopsticks into your food.

A. It    R. That C. This    D. They

(   ) 11. It's impolite to      others.

A. point to    Ii point at C. point out    D,point with