I had tomy little sister when my mother was not at home.
Is the man over there your English teacher ? –No, it ______ be him. He has gone to Canada to study further.
It is to teach a kid the way to solve problems than to tell him the solutionsdirectly.
My coat _______ there behind the door. Can’t you see it?
The doctor insisted that only in this ______ could the patient survive in the operation.