By the time of last year, she ______ the piano for five years.

Mr Green teaches_____________English. He teaches English very well.

Such a chance, once ________, might never come again[ ]

As we all know, the Silk Road _________ China to the West in ancient times.

.—Was the manager angry with you when he saw you playing computer games in offece hours?—No, he was not angry at all ____ I was doing, but just said, “ Go back where you were.”