He is a strict but kind teacher, ___is always trying to make his classes __ and interesting .

Why did _____ take Aunt Alice almost an hour to gethome —I don’t know . Maybe there was something wrongwith her car .

What a big difference Tu Youyou has made to modern medicine in the world！She says she will________ her study.

and disappointed, therescue team finally reached _____ used to be a village

Did Mike call ______you yesterday?— No, but this morning he called _______my office