．— Catherine, I have cleaned the room for you．
— Thanks, but you ________it．I could manage it myself．
| A．needn’t do | B．needn’t have done | C．mustn’t do | D．shouldn’t have done |
It seems that living green is ______ easy and cheap. A small step can be rewarded with long-term benefits.
| A．astonishingly | B．exactly | C．fortunately | D．hardly |
What impressed me in Greece was that the oceans _______ the islands were deep blue and many cities lay on the bay.
| A．surrounding | B．being surrounded | C．surrounded | D．surround |
Researches show that the taller you are, the more _______ you are to suffer back pain.
| A．likely | B．possible | C．perhaps | D．probable |
One way to ______ species under threat of extinction is to remove them to zoos and parks and feed them there.
| A．reserve | B．prevent | C．preserve | D．reduce |
According to the statistics, listening to loud music at rock concerts ______ hearing loss in some teenagers in the past 2 decades.
| A．have caused | B．caused | C．had caused | D．has caused |