16. I hope pollution _________ worse next year.
A. will not be B. won't be C. A and B are correct
17. Sky safety system _________ everyone from crashing.
A. will do stop B. will stop C. will be stop
18. What problems do you think future transport _________?
A. will have B. have will C.do have
19. I'm not sure I _________ travelling by hot-air balloon again or not.
A. will trying B. will be C. will try
20. _________ this captain probably ___________ a wind-powered ship in the coming time?
A. Is … buying B. Will … buy C. Did … buy