The flu is believed ______ by viruses that like to reproduce in the cells inside the human nose and throat.
| A．to be caused | B．to have caused | C．being caused | D．causing |
（全国II 6）.—Is it all right if I keep this photo？
---_______.
| A．No，you don’t | B．No, it shouldn’t | C．I’m afraid not | D．Don’t keep it |
. (全国I 35).—Was he sorry for what he’d done？
—_________.
| A．No wonder | B．Well done | C．Not really | D．Go ahead |
情景交际
（全国I 31）.—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. |
. Such poets as Shakespearewidely read，of whose works，however，some _difficult to understand.
| A．are；are | B．is；is | C．are；is | D．is：are |
. Listening to loud music at rock concerts ______________caused hearing loss in some teenagers.
| A．is | B．are | C．has | D．have |