15. must have been　　　　　　　　　　　　　　

14. will have left for

13. to get changed　　　　　　　　　　　　　　　

12. died down

11. with/for the purpose of　　　　　　　　　

20. as if it were broken

(11)参考答案

19. was so delighted

18. Keeping fit

17. so is our thinking

16. don’t think it necessary