—— Sorry, Professor Smith. I didn’t finish the assignment yesterday.—— Oh, you ________ have done it as yesterday was the deadline.
I would appreciate ________ if you could teach me how to use the computer.
The ___ look on the girl’s face suggested that she ___ such bad news.
We must work hard toa good knowledge of English.
_________ by the beautiful scenery of the west Lake, the foreigners decided to spend another two days in Hangzhou.
Our class _______ 55 students at that time.