题目内容：

根据中文提示写出单词或词组，使句意完整、正确。

1.Great changes have taken place in China in ______（最近的）years.

2.—How many boys are there in your class?

—Thirty, about sixty_____(百分之)of the students in our class.

3. —The water in the river is dirty.

—Government has passed_____ (法律) against water pollution.

4.He joined the______(军队) in 2000.

5.“The greenhouse effect”causes the level of the oceans to_____ (上升).