—Look! The lights in the teachers’ office are still on. Is Mr. Li working?—No. It _______ be Mr. Li. I saw him leave just now.
—_did he come? —He came to ask for help.
My brother and 1in Yinchuan since 1997.
We have only one Earth. It’s our common _.
—Need I wash your car after repairing it? —Yes, that would be much _.
—When will he leave for Shanghai? —As soon as he _ his work.