It was very kind of you to do the washing up, but you _______ it.
| A．mustn't have done | B．wouldn't have done |
| C．mightn't have done | D．didn't have to do |
Everyone thinks he’ll go far in this company because he has all the qualities necessary_________ success.
| A．to | B．with | C．on | D．for |
After suffering a heart attack, Michael Jackson was pronounced dead, _________ a tragic end to the world’s most popular entertainer.
| A．marking | B．to mark | C．marked | D．having marked |
After graduation I’d like to find a job _________ I can use what I have learnt at school.
| A．whose | B．which | C．where | D．that |
The traffic slowed down because of the heavy snow in Yushu county, presenting a new _________ to the recovery from the earthquake.
| A．suffering | B．disaster | C．challenge | D．damage |
—The terrible accident is under investigation.
—Actually, quicker action _________ those workers trapped in the mine.
| A．might have saved | B．must have saved | C．should have saved | D．could have saved |