【推荐1】When the lights are out, they are ______ (visible). (所给词的适当形式填空)

【推荐2】Babies of two months old do not appear to be __________ to enter the water.

【推荐3】单句填空
1. Our class had a heated debate ______ whether students should be forbidden to have mobile phones in school.
2. Jack went to a remote village to do some ______ (volunteer) work.
3. The boy prefers English ______ Chinese.
4. True happiness comes when we learn to be content ______ what we have.
5. In other words, every action and ______ (move) in Beijing Opera is important.
6. I don’t think the film is ______ (suit) for children because it contains some violent scenes.
7. ______ (actual), a large number of people own cars in our hometown.
8. In the coming three years, our school life will be ______ (challenge).
9. The survey shows people are ______ (confuse) about what they should eat to stay healthy.
10. Having stayed in China for many years, he can speak Chinese ______ (fluent).
11. My sister will graduate ______ Peking University this July. And I am proud of her.
12. Our teacher recommends that we ______ (take) exercise regularly to keep fit.
13. We should learn their ______ (advance) experience in management.
14. Diet and exercise are ______ (obvious) important if you want to lose weight.
15. The girl had to quit ______ (learn) painting because her parents couldn’t pay the fee for her.
16. There is still room for ______ (improve) in your work.
17. It is everyone’s ______ (responsible) to protect the environment.
18. The scientists are beating their brains out trying to come up with a ______ (solve) to the problem.
19. After ______ (graduate), we need to work hard to support ourselves.
20. Practise more and I believe you can speak English ______ greater fluency in the future.