【正文】
hem _____ the holes. They _____ water from the river _____. They______ the young trees. Trees are very _____ to people. They can _____ the can make the air _____ and _____. The students want to make their country ______. 二 . Change the sentences into general questions. 1. Gao Wei and his classmates went to plant trees. Did Gao Wei and his classmates go to pl