17.did I realize

16. With a lot of difficult problems to settle

15. is engaged in　　　　　　　　　　　

14.In common with

13.whether human cloning should be allowed　　

12.staying at home and listening to music

11. has a good knowledge of　　　　　　　　　

20. invited to the meeting

(24) 参考答案

19.drinking to/you drink to　　　

18.every two days