My mother is __________ English teacher in a middle school.

You seem tired, David.—YesI _____ all day long and can’t wait to go to bed now

If human beings had been a bit less greedy and cruel, more birds and animals ______ dying out. [ ]

____ the afternoon of June 2nd, many foreigners arrived ______ Shanghai.

Why weren’t you at the meeting — I________ for a long distance call from my sister in America.