Experts say walking is one of the best ways for a person to _____ healthy.
| A．preserve | B．stay | C．maintain | D．reserve |
how can you possibly miss the news ? It _____ on TV all day long.
| A．has been | B．bad been | C．was | D．will be |
Although he has lived with us for years, he ______ us much impression.
| A．hadn’t left | B．didn’t leave | C．doesn’t leave | D．hasn’t left |
No one in the department but Tom and I _____ that the director is going to resign.
| A．knows | B．know | C．have known | D．am to know |
I thought Jim would say something about his school report, but he ______ it.
| A．doesn’t mention | B．hadn’t mentioned | C．didn’t mention | D．hasn’t mentioned |
The news came as no surprise to me. I _____ for some time that the factory was going to shut down.
| A．had known | B．knew | C．have known | D．know |