22.　 more or less或多或少

21.　 half a metre deep半米深

20.　 at the right time在正确的时间

19.　 correct the mistakes改正错误

18.　 in and out of class课内外

17.　 hand in交上来

16.　 thanks to多亏

15.　 point to/at指向

14.　 in a few years’ time几年后

13.　 move towards向…移动