1 get into trouble with sb
2 skim over
3 no problem
4 work out
5 return sth to sb
6 be friendly to sth
7 refuse to do sth
8 volunteer to do sth
9 communicate with
10 make sb angry
11 get along well with
12 go to the best university
13 exam skills
14 compete with
15 cross out
16 compare with
17 help each other
18 cause stress
19 in one's opinion
20 turn down
以上是参考答案！
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