The professor paused as if ___________ his students to ask questions on the point he had just made.

Professor White has received a letter ___ to give a lecture in Peking University.

------ English has a large vocabulary, hasn’t it?------Yes.____more words and expressions and you will find it easier to read and communicate.

- Did you get a dictionary?　　- No, I _____, but there were not any _____.

“Why was a special meeting called?” “______ a new chairman.”