Many trees _______ on the hills last year. And we will plant more this year.

.It was obviously that the man ______ driving on the free way for almost an hour when he ______ that he must come back.

Have you got any friends in China?—________．Daming and Lingling are my good friends．

Mr. Liu is our new head teacher this term and he wants to know _______.

In our school library, there____ a number of books on science and the number of them ______ growing larger and larger.