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21. The door won't open.門不能開�！� open an account 開個(gè)賬戶　 leave the door open 讓門開著　 declare sth open　 宣布…開始 be open to the public　 對公共開放opening speech 開幕詞

20. only　　 僅僅　　 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 單方面one by one 一個(gè)接一個(gè)

18. I have been here once.(一次) I once lived here.(曾經(jīng))　 once again 再來一次

at once 馬上, 同時(shí) 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 偶爾

17. have nothing on 沒穿…　 go straight on/ahead　 筆直朝前　　 on the table

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

play a joke on sb 開…一個(gè)玩笑　　 in time 及時(shí)　　　 on time 準(zhǔn)時(shí)　　

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.

16. omit 省略　 You may omit the second paragraph from the article.

15. an official letter　 公函　 　　news from an official source　 官方消息

14. offer to do = make an offer to do 主動(dòng)提出做…　　　 offer sb sth = offer sth to sb　　 提供　

　　 I offered him ￥100 for his bike. 我出100元買他的車。

13. offend sb　 冒犯　　 be offended with sb　 生…的氣　　 be offended at sth

12. see sb off　　 turn/switch off　　 take off 取消，脫衣，起飛，離開　　 be well off 富有

pay off 還清　　 be off duty 不上班　 　　off the point 不在要點(diǎn)

May Day is only a week off.　 五一只有一星期了.