－Don't forget to return the book in two weeks.
－______. Don't worry about it.
| A．Yes, I will | B．No, I won't | C．Sorry, I don’t | D．I don't think so |
I can't understand why he ________ so selfish. He isn't usually like that.
| A．was | B．had been |
| C．is | D．is being |
—How long have you been going to work on foot?
—Since last month when I ________ from a heart attack.
| A．recovered | B．have recovered |
| C．was recovering | D．would recover |
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 |