1．Human biological rhythms are related to the natural cycle of day and night.
2．The person told me that he was trying to find every chance to pay(pay) back the help that people gave him when in trouble.
3．So employed(employ) was he in playing computer games that he didn’t hear the knock.
4．I always hesitate to advise(advise) my friends on what to read.
5．Which are you more likely to have(have) with you at any given moment—your telephone or your wallet?
6．Having been ignored(ignore) for a long time，the boy sitting at the back felt bored and went out.
7．By the time of tomorrow morning, I will have left(leave) the country.
8．There are various kinds of jobs in the world，but different people are attracted(attract) by different jobs because everyone has his own interest and destination.
9．With the final examination approaching(approach), we are busy going over what we’ve learned this term.
10．The young man climbed the tree and picked all the pears within his reach.
11．I observed him trying(try) to force the lock of the door open when I passed by, so I called the police.
12．The final score of the basketball match was 93∶94.We were only narrowly(narrow) beaten.
13．Mary will show up at the concert tonight because she is anxious to see(see) the famous singer.
14．They saw he was in difficulty and came to his aid.
15．There was still a distance(distant) between me and my father.
