Mr. Li, let’s go fishing this weekendwith Lao Wang, shall we?—I’d love to, but nobody knows if he _______ freethen.

.The school meeting ________ once every two weeks in the concert hall.

People should ______ from ______ down the trees to protect the earth.

________ in my life impressed me so deeply as myfirst visit to Qinghai Lake.

The water and soil conservation project resulted infarmers ______ the crops on the farmland _____ trees and grass.