You shouldn’t have the machines ______ all the while. You ought to have them ______ now and then.
| A．run; repair | B．running; repairing | C．run; repaired | D．running; repaired |
—______ have you studied English?
—For six years.
| A．How long | B．How soon |
| C．How often | D．How far |
Nuclear radiation is said __________ the biggest health challenge in Japanese Earthquake over the past few months．
| A．being | B．to be | C．to have been | D．that it is |
They must have been enjoying themselves there，or they __________ so long．
| A．wouldn’t stay | B．needn’t have stayed |
| C．wouldn’t have stayed | D．couldn’t stay |
—Did you enjoy your journey to the village?
— __________．We had driven more than 3 hours before we found the right way．
| A．Of course | B．Quite a lot | C．Not exactly | D．No problem |
He telephoned to inform me of your birthday．____________，I would have known nothing about it．
| A．However | B．Otherwise | C．Therefore | D．Thus |