1 . You won’t make the team if you don’t ________ ________(参加选拔). (根据汉语提示完成句子)

2 . Dr. Lin did not r_________ until the day she died. (根据首字母单词拼写)

5 . It is__________ __________ for teenagers of your generation to be attracted to computer games and the online world. (根据句意填空)

6 . What ________that caused the plane crash?

A．you think was it

B．do you think was it

C．you think it was

D．do you think it was

7 . Sam has finished his homework. (改为否定句)
Sam ________ ________ finished his homework.

8 . We ________(not) get homesick when we get back home. （所给词的适当形式填空）

9 . If we _______ (not, act)now to protect the environment, we’ll live to regret it. (所给词的适当形式填空)

10 . 但是，我们可以确定的是，文化和美食这两者息息相关，如果你没有体验过其中的一个，你就永远无法真正了解另一个。
What we can say, however, is that ________, and ________, you can never really know the other.