16. 更远的恒星有一天可能被参观。

Farther planets________ ___________ _________ one day.

15. We must wash our hands before meals.(改为被动语态）

Our hands ________ __________  ________        before meals.

14. The classroom must be cleaned after school. (对画线部分提问）

            the classroom             ？

13. Can you take good care of the children?(改为被动语态）

       the children ________ ___________  good care of?

12. We should clean our teeth twice a day.(改为被动语态）

Our teeth should            twice a day.

11. Nobody can answer the question.(改为同义句）
The question      answered by anybody.

10. Should I       (allow) to make my own deci?sions?

9. The fruit should      (keep) well during winter.

8. Can this kind of bike        (buy) in that shop?

7. The stars can      (not see) in the daytime.