1 . Pollution p________ people from seeing objects in the sky that they could see quite easily in the past. (根据首字母单词拼写)

2 . 我可能要离开两周, 如果我不能按时还书怎么办?
I may be away for two week. __________ __________ I can not return the books on time?

3 . On Christmas eve, family members always e ____ gifts. (根据首字母单词拼写)

5 . Not only Jim but also his sister_________ a few cities in the south since they came to China.

A．have visited

B．has visited

C．visited

D．visits

6 . It really a________ me when people forget to say “sorry”. (根据首字母单词拼写)

7 . 他们期待参加这次志愿者活动，在活动中他们可以帮助无家可归的人。(look forward to;定语从句) (汉译英)

8 . 无论遇到什么困难， 我们应该对生活持积极的态度。（no matter; attitude) (汉译英)

9 . I was on the point of leaving for work            I realized I had forgotten my keys.

A．until

B．while

C．before

D．when