Although the causes of cancer ____we do not yet have any practical way to prevent it.
| A．are being uncovered | B．have been uncovering |
| C．are uncovering | D．have uncovered |
Today many physical bookstores ________ down with financial difficulties, inflexible management strategies and competitive pressure from online bookstores.
| A．had closed | B．having closed |
| C．being closed | D．are closing |
Since 1 won the big prize，my telephone hasn’t stopped ringing. People____to ask how I am going to spend the money.
| A．phone | B．will phone |
| C．were phoning | D．are phoning |
7.Although the causes of cancer ____， we do not yet have any practical way to prevent it.
| A．are being uncovered | B．have been uncovering |
| C．are uncovering | D．have uncovered |
—Why do you look so puzzled?
—Oh，I ________ over a most difficult maths problem.
| A．thought | B．have thought |
| C．am thinking | D．think |
--- Why are you so angry?
--- Jack failed to return my tennis bat on time again. He _______his words.
| A．is always eating | B．has always eaten |
| C．always eat | D．always ate |
I’m glad to see your health ______ after the operation.
| A．picking up | B．setting up | C．taking up | D．getting up |
--- Why don’t you ride your bicycle today?
--- Oh, it broke down. It ________ now.
| A．is repairing | B．is being repaired |
| C．is repaired | D．will repair |
6.I have to go to work by taxi because my car ____at the garage.
| A．will be repaired | B．is repaired |
| C．is being repaired | D．has been repaired |
With more forests being destroyed, huge quantities of good earth ______ each year.
| A．is washing away | B．is being washed away |
| C．are washing away | D．are being washed away |
Everybody in the village likes Jack because he is good at ______ and telling jokes.
| A．making up | B．turning up |
| C．putting up | D．showing up |
The aging population _____ each day .There must be some kind of interesting activity for the old.
| A．has grown | B．grew | C．will grow | D．is growing |
—Sorry，sir，your car isn't ready yet.
It ________ by our workers.
—Oh，my God，when can I come to fetch it?
| A．is repaired | B．has been repaired |
| C．is being repaired | D．will be repaired |
I'll go to the library as soon as I finish what I ________.
| A．was doing | B．am doing |
| C．have done | D．had been doing |
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