People must plant trees to prevent sandstorm_____ A from hap

People must plant trees to prevent sandstorm_____ A from hap We must prevent people from _(pollute) the river. If we want to make our city() ,we must plant more trees.A.is we must_____people from cutting down trees A stopB prevent C we must try our best to prevent tht flu from spread ____ a h we must plant more trees to ____ our planet greener. something must be done to prevent some students from froping Something must _____(do) to prevent flood from ______.(happe people plant more and more trees to protect the earth 中文翻译How to prevent people from infecting AIDS? prevent to与 prevent from的区别 march is a time to plant trees and grass