根据中文提示写出单词或词组,使句意完整、正确。Great changes have taken place in China in ______(最近的)years.
—How many boys are there in your class?
—Thirty, about sixty_____(百分之)of the students in our class. —The water in the river is dirty.
—Government has passed_____ (法律) against water pollution.He joined the______(军队) in 2000.
“The greenhouse effect”causes the level of the oceans to_____ (上升).
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