The old man has retired from the factory. He _____ there for 30 years.
A．works B．worked C．has worked D．was working
—I don’t mind telling you what I know.
—You _____. I can manage it myself.
A．mustn’t B．ought not to C．can’t D．don't have to
The decorations were so lovely that they _____ in a short time.
A．sold out B．has been sold out C．were sold out D．were selling out
The students _____ are hard-working and ready to help others should be praised.
A．who B．whom C．which D．whose
—What’s the noise outside?
—Some children_____ hide-and-seek in the yard.
A．were playing B．are playing C．have played D．played
It was not until Bob took off his dark glasses that I _____ him.
A．realized B．requested C．recorded D．recognized
