26. or so 等等　 sooner or later 迟早

25. We opposed the plan because of the cost.　 反对该计划因为…

be the opposite of　　 …对立面　　　　 Black is the opposite of white.

be opposite to　　 与…相对的　　 Black is opposite to white.

The house is opposite the road.　 (on the other side of)

24. have the opportunity to do/ for/of doing　 有去做…机会　

23. What's your opinion of the book ? = How do you like the book ?=What do you think of the book?　 have a good/poor opinion of 对…印象好/坏 in one's opinion = to one's mind 据…看来

22. operate the machine 开动机器　　 operate on sb　 给某人动手术　　

perform an operation on sb　 come into operation = come into effect = come into force 开始生效

21. The door won't open.门不能开。　 open an account 开个账户　 leave the door open 让门开着　 declare sth open　 宣布…开始 be open to the public　 对公共开放opening speech 开幕词

20. only　　 仅仅　　 Only he saw the tiger.　 He only saw the tiger.　　 He saw only the tiger.

Only in this way can you do it well.　　　　 not only… but also…　　 too…to…

only too...to = very　　 I am only too glad to meet you.

19. in one/same direction同一方向one-sided 片面的 one-way 单方面one by one 一个接一个

18. I have been here once.(一次) I once lived here.(曾经)　 once again 再来一次

at once 马上, 同时 I can't do two things at once.　　　 once more 再一次 (once again)

once a day 每天一次　　　 once in a while 偶尔

17. have nothing on 没穿…　 go straight on/ahead　 笔直朝前　　 on the table

There is a new film on on channel 8. 上演 ,　

play a joke on sb 开…一个玩笑　　 in time 及时　　　 on time 准时　　

be based on　　　 on business 因公 on holiday 度假　 on the way to 在途中

on foot　 on tiptoe 悄悄地　　 on hire　

on purpose = by design　　 正好相反　　　 on the other hand 另一方面　

on doing 一…就…　　 On getting off the plane, I recognized him.