A.
1. recycle
2. fumes
3. pollution
4. rubbish
5. rain
6. trees
7. clean out
8. station
B.
9. emit
10. reduce
11. role
12. solar
13. out
14. join
C.
15. have been reading
16. have been playing
17. has been cleaning
18. has been swimming
19. has been speaking
20. have been waiting
21. have been doing
22. has been snowing
23. have been riding
24. has been explaining
D.
25. did he?
26. don't they?
27. can't they?
28. is he?
29. will we?