1.Will there be less pollution?（做否定回答）
No,there won't.
2.I think he will come back ｛tmmorrow｝(就括号提问)
When do you think (你原题少了个空）he will come back?
3.Lingling likes the beautiful city(改为同义句)
Lingling is fond of the beautiful city
4.Playing sports is a good habit(改为同义句)
It is a good habit to play sports.
我有绝对把握.相信我!