17．used to do sth．过去常常

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

16．devote…to sth．／sb．献身于；致力于

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

15．quarrel with sb．about sth．为……争吵

　 She often quarrels with her husband about housework．

14．struggle against与……作斗争

　 We are struggling against pollution．　　 、

13．work out算出；计算出

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

12．wear out(使)筋疲力尽

　 I was worn out from the long walk．

11．stick with和……在一起，保持联系

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

10．stick to sth．／doing sth．坚持

Einstein stuck to his opinion and went on with his research

9．spend…on sth．／in doing sth．在……花(钱，时间等)

She spent lots of her money on clothes．

8．refer to指；谈到；参照

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