16.have a ball 替换 have a good time/enjoy oneself
After visiting the workshop, we went back to school.
Every one of us had a ball(had a good time).
17.come up with 替换 think of
Jack is very clever, he often comes up with(thinks of) new ideas.
18.set aside 替换 save
Some students think that they should set aside some of their pocket money for books.
19.be of + n.替换 adj
The products are of high quality(very good) and are sold everywhere in China.
20.refer to 替换 talk about/of, mention
The professor you referred to(talked about )is very famous.
21.can not but/ can not help but 替换 have to do
I could not but(had to) go home.
22.more often than not 替换 usually
More often than not(Usually), the meaning of many words can be easily guessed.
23.lest 替换 so that/ in order that
I wrote down his telephone number so that I would not forget it.→
I wrote down his telephone number lest I(should) forget it.
24.be long for sth/ be long to do sth替换
want to do sth/wish for
I want to see you very much.→I am long to see you.
25.be caught up in/be crazy about/be absorbed
in/ be addicted to 替换 be interested in
He is caught up in( very interested in )collecting stamps.
26.more than 替换 very
I'm very glad to learn that you are coming in September.→
I'm more than glad to learn that you are coming in September.
27.perfect(ly) 替换 good/ very well
He speaks perfect( good)English./He speaks English perfectly( very well )
28.do sb a/the favor 替换 help
Would you please do me the favor(help me) to turn down the radio?
29.the other day 替换 a few days ago
The other day my brother and I went to the cinema by bicycle.
30.in the course of 替换 during
In the course of ( during) the mountain climbing,please help each other and pay special attention to your safety.