While he ________ his homework , his mother came in.

It was the training that he had as a child________made him such a good pianist, received by teenagers as well as adults．

I hope all the precautions against air pollution, _____ suggested by the localgovernment, will be seriously considered here.

Miss Lin ____ a lot of work for the poor area for about 10 years.

What’s the time by your watch?—It’s ________.