题目内容：

选用方框中所给单词的适当形式填空。

1.—How long did Qing Dynasty rule（统治）over China?

—Over two _______ and a half.

2.Don’t worry about her. She is old enough to think for _______.

3.Their classroom is _______, and they have to wait for their teacher to open it .

4.________ on the ice is a popular outdoor activity in the north of China.

5.The students are so ________ because they will go to the park for a picnic tomorrow .