17.The population of China _____ (reach)more than 1.2 billion so far．

16.He said he _____ (not go)to Nantong if it _____ (snow)the next day．

15.The trees must _________(water) as often as possible.

14.We have no time _______(think) about it.

13.Lucy _____(look) for her pen everywhere. But she can’t find it.

12.I find it hard ______(study) Japanese well.

11.Peter said that he _________(fly) to New York the next week.

10.The doctor told Mrs Smith ____________(not eat) too much.

9.They spend the day ________(play) with their friends.

8.The teacher _____(tell) us the moon _____(get) its light from the sun.