–Excuse me , Sir . Smoking is not allowed here .
–Oh, sorry. I __________.
| A．haven’t know | B．don’t know | C．hadn’t know | D．didn’t know |
Allen has decided that he will be an engineer by the time he ________ twenty.
| A．had been | B．is going to be |
| C．will be | D．is |
．The sweater ________ easily; isn't it suitable for a person as lazy as you?
| A．is washed | B．was washed |
| C．washes | D．has washed |
—It seems that you know Dr. John very well.
—Of course, we ________ together for five years in the 1990s.
| A．have worked | B．had worked |
| C．are working | D．worked |
A recent survey shows the number of people who shop in stores ________， while far more are shopping online.
| A．decrease | B．decreases |
| C．is decreasing | D．are decreasing |
I won't buy this iPhone unless the price ________ to under 2,000 yuan.
| A．reduces | B．will be reduced |
| C．has reduced | D．is reduced |