Lawrence Craven, a doctor from the US, introduced the idea in 1953 _______ aspirin has the potential to reduce the risk of heart attacks.
| A．that | B．when | C．which | D．why |
—How could you be so rude as a walk in here in the middle of my class?
—________.(2011·四川，5)
| A．Nothing much | B．Nothing serious |
| C．Never again | D．Never mind |
—You can have a pet dog，but suppose you get bored with it in a few days？________？
—We won't，we promise！(2011·安徽，29)
| A．Then what | B．All right |
| C．How come | D．So what |
—We're organizing a party next Saturday，and I'd like you to come.
—________！I have another one that day.Thank you just the same.
| A．Good luck | B．What a pity |
| C．Never do it again | D．Well done |
—What a fine day！Shall we go picnicking?
—________.But we need to be home before six o'clock for the football match.
| A．Have a nice time | B．Pardon me |
| C．That's great | D．You are right |
—Everybody is going to climb the mountain.Can I go too，mom?
—________ Wait till you are old enough，dear.
| A．Will you? | B．Why not? |
| C．I hope so. | D．I'm afraid not. |