I would have come to see you earlier, but I__________too busy.
| A．had been | B．were | C．was | D．would be |
Mary ______ my letter; otherwise she would have replied before now.
| A．has received |
| B．ought to have received |
| C．couldn’t have received |
| D．shouldn’t have received |
People are advised not to drive after drinking, but __ seems not to help a lot.
| A．it | B．which | C．they | D．one |
Nobody can achieve anything of real significance _____ he works very hard.
| A．if | B．unless | C．meanwhile | D．as |
You have to balance the advantages of living in the country ______ the disadvantages.
| A．for | B．to | C．against | D．with |
The 30th Olympic Games, ______ between July 27 and August 12 in 2012, will take place in London.
| A．scheduling | B．to schedule |
| C．scheduled | D．to have scheduled |