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
① 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. ( NMET 2003 )
② If there is anything I can do for you, I would be more than glad to help.(2004全国卷)
27．perfect (ly) 替换good/ very well
He speaks perfect ( good ) English./ He speaks English perfectly ( very well ).
28．do ** 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. ( NMET 1997 )
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.

• perfectly [´pə:fiktli] ad.理想地；完美地 (高中英语单词)
• bicycle [´baisik(ə)l] n.自行车 (高中英语单词)