The president stressed that young people's values determine the values of the future society, and more efforts should be made to ensure young people's cultivation of sound value systems, ________ are still in the formation stage.
| A．which | B．what | C．when | D．where |
A terrible earthquake struck Sichuan Province on May 12, _____ tens of thousands of lives.
| A．claiming | B．claimed | C．causing | D．caused |
--- What’s the matter with Jason. He looks a bit upset.
--- Didn’t you know? When returning from his holiday last night, he found his house________.
| A．broken off | B．broken into | C．broken out | D．broken down |
Oh, it’s so cool in the house. You _______ have turned on the air-conditioner, haven’t you?
| A． should | B．might | C．must | D．can |
Fathers often feel __________ their duty to earn more money for their family.
| A．that | B．it | C．one | D．what |
--- ________ the class done most of the work?
--- Yes, but the rest ___________ rather difficult.
| A．Has, are | B．Has, is | C．Have, are | D．Have, is |