【单选题】( )enough water, the trees can grow well.
【单选题】The trees can prevent the rain _______ the ground directly. [ ]
【简答题】用正确的单词填空。 1. The trees can stop the flood from ______ (wash) the earth away. 2. You'd better ______ (not go) to the supermarket. 3. You must practise ______ (play) the piano every day. 4. He hasn't en...