2. It was so noisy it was hard to carry ________ a conversation.

3. You promised to help - you mustn't back ________ now.

4. The teacher asked each of us ________ turn to describe how alcohol affects our lives.

IV. 用关系词when, where, who, whom, which, that完成下列句子。

1. Sunday is the day ________ very few people go to work.

2. Cindy brought with her three friends, none of ________ I had ever met before.

3. Jennifer used to live in Rome, ________ she taught English.

4. I discussed it with my brother, ________ is a lawyer.

5. Now they were driving by the houses ________ Andy had described.

6. There are lots of things ________ I need to buy before the trip.

V. 翻译方框内所给的短语，并用其适当形式完成下列句子(每个短语限用一次)。

a. ________ 发生，爆发

b. run out of ________

c. stand by ________

d. ________ 使理解（某事） 1. The meaning of your paper won't ________ to the group if you use too many difficult words.

2. The student is ________ his opinion that his answer is also right.