17．used to do sth．過去常常

　 There used to be a brook in front of my house when 1 was a little child．

16．devote…to sth．／sb．獻身于；致力于

　 After he graduated from university，he devoted himself to the teaching work in the countryside．

15．quarrel with sb．a(chǎn)bout sth．為……爭吵

　 She often quarrels with her husband about housework．

14．struggle against與……作斗爭

　 We are struggling against pollution．　　 、

13．work out算出；計算出

　 The maths problem is too difficult for me to work out．

12．wear out(使)筋疲力盡

　 I was worn out from the long walk．

11．stick with和……在一起，保持聯(lián)系

He stuck with(=remained in)the firm for 20 years.

10．stick to sth．／doing sth．堅持

Einstein stuck to his opinion and went on with his research

9．spend…on sth．／in doing sth．在……花(錢，時間等)

She spent lots of her money on clothes．

8．refer to指；談到；參照

　 When I said some people are stupid，I wasn’t referring to you．