根据句意填写单词。

1.  How heavy the pig is! It_____at least 200 kilos.

2.  He had a toothache.  He went to the dentist to_____the tooth out.

3.  If I have_____time,  I enjoy working in the garden.

4.  There are many kinds of_____cars in his bookcase.

5.  Different kinds of birds are kept in a large_____ in the zoo.

6.  The earth is a _____which travels around the sun.

7.  There are five yellow stars in our national _____.

8.  We must stop using_____bags to protect the environment.

9.  The cage is too_____for two tigers to live in.

10.  Mr Green is _____of her son,  who won the first prize in the singing