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8. They were walking along the shore a huge wave appeared out of nowhere,sweeping them out to sea.

   A. as   B. while   C. when   D. though

7. regular exercise is very important,it's never a good idea to exercise too close to bedtime.

   A. If   B. As

   C. Although   D. Unless

6. —Why do you drink so much coffee?

—Well, it doesn’t keep me awake at night,I see no harm in it.

   A. although   B. as long as

   C. while   D. where

5. ，you can't lift the heavy box up.

   A. Even you are strong   B. Strong as you are   C. How strong you are   D. As you are strong

4. The old tower must be saved, the cost.

   A. however   B. whatever

   C. whichever   D. wherever

3. Many of them turned a deaf ear to his advice, they knew it was practical.

   A. as if   B. now that

   C. even though   D. so that

2. I won’t call you , something unexpected happens.

   A. unless   B. whether

   C. because   D. while

II.單項填空

1. It sounds like something is wrong with the car's engine. ，we’d better take it to the garage immediately.

   A. Otherwise   B. If not

   C. But for   D. If so

6. 1 won’t go to the party (除非受到邀請) .

5. You’d better write the telephone number down (以免你忘了) .