—I haven't seen Tom for years. Any news about him?
—He __________ in a toy factory for two years. Now he is a farmer.
| A．worked | B．has worked |
| C．had worked | D．would work |
Faced with financial uncertainty, the family decided to____ their trip to Europe to save money.
| A．call off | B．call for | C．call in | D．call on |
—How about going out for a picnic on Sunday morning?
—Hmm．___．The weather is very good these days．
| A．Yes, why not | B．Well, no way |
| C．Oh, never mind | D．Sure, no matter |
Years ago we didn’t know this , but recent science______that people who don’t sleep well soon get ill.
| A．showed | B．has shown | C．will show | D．is showing |
.It is said that the early European playing-cards ______for entertainment and education.
| A．were being designed | B．have designed | C．have been designed | D．were designed |
31.The company had about 20 notebook computers but only one third _______used regularly . Now we have 60 working all day long.
| A．is | B．are | C．was | D．were |