13．You'd better　　　　　　　　　 (not go)out because it's snowing heavily．

12．She　　　　　　　　 (put)all her effort into ballet training before she entered the film industry．

11．She likes talking to others while she　　　　　　　　　　 (wait)for the bus．

10．Among those　　　　　　　　 ，which do you think is the most useful one?

Ⅲ．用动词的适当形式填空。

9．On the mountain there　　　　　　　　　 to be millions of trees，but there is nothing left now．

8．I don't know if there will be a　　　　　　　　 tomorrow．

7．He got lost in the city．What was　　　　　　　　 ，he lost all his money．

6．The　　　　　　　　 in the library are full of books．

5．The Eiffel T　　　　　　　　　　 of Paris is very famous in the world．

Ⅱ．用所给词的适当形式填空。

4．Kitty got　　　　　　　　　 (have a husband)last year．Her husband is a computer programmer．