______ environmental damage is done，it takes many years for the ecosystem to recover．
| A．Even if | B．If only |
| C．As if | D．Once |
Spending a few hours learning about the history and culture of the destination will help tourists understand they're seeing
| A．what | B．where |
| C．that | D．why |
You'd better prepare some candles at home the power fails．
| A．even though | B．in case |
| C．as long as | D．in order that |
1 think we'd better keep to the subject, we'11 waste our time．
| A．and | B．or | C．but | D．so |
—How are you getting along with your German, Kate？
—Oh, Mr．Black, I’m so tired of it．Maybe I should drop out _____ it kills me．
| A．when | B．after | C．while | D．before |
She doesn’t speak our language, _____ she seems to understand what we say．
| A．for | B．and | C．yet | D．or |
_____ he promised that he wouldn’t be late，he didn’t arrive until the end of the party．
| A．Since | B．Although |
| C．Because | D．Until |
______ we have planned ahead might change when we put it into practice．
| A．Whatever | B．Whenever |
| C．Whoever | D．However |
Shut the window, ______ it’ll get too cold in here.
| A．so | B．yet | C．but | D．otherwise |
Supporters of underground development say that building down ______ building up is a good way to use the earth’s space.
| A．as well as | B．other than |
| C．rather than | D．more than |
— How long do you suppose it is ______ he arrived here？
— No more than half a week.
| A．when | B．before | C．after | D．since |
_____________ hard you try，it is difficult to lose weight without cutting down the amount you eat.
| A．Whichever | B．Whatever | C．However | D．Whoever |
------Do you know anything about China’s space program?
------Yes, ________ I know, China will send woman astronauts into space in the near future.
| A．As long as | B．So far as |
| C．As much as | D．As soon as |
_____ you talk to or write a message to someone, you show your language skills to others.
| A．Every time | B．Some time | C．At times | D．The time |
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