From space, the earth looks blue. This is ________ about seventy-one percent of its surface is covered by water.

试卷相关题目

• 1______we all tried our best, we lost the game in the end.

  A.As

  B.Although

  C.Because

  D.Since

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• 2______is known to us all is that the old writer, for ______ life was hard in the past, still works very hard in his eighties.

  A.What; whom

  B.As; whom

  C.It; whose

  D.What; whose

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• 3Actually, ________ he was put into prison, he wouldn't give in．

  A.if

  B.even though

  C.when

  D.as if

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• 4Although they did heavy work that day, ________ they were all in high spirits．

  A.yet

  B.so

  C.but

  D./

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• 5I had been looking for the book for two days _______ I found it at last

  A.until

  B.when

  C.while

  D.before

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• 6-- I am going to Sidney for further studies next month. -- That's fantastic. Can you keep emailing me ______ you are there?

  A.though

  B.because

  C.until

  D.while

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• 7________ he makes up his mind, Sam will never give up．

  A.While

  B.Though

  C.As soon as

  D.Once

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• 8I always take something to read when I go to the doctor's ________ I have to wait．

  A.in case

  B.so that

  C.in order

  D.as if

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• 9Why not seize it _______ you've got such a good chance?

  A.now that

  B.that

  C.where

  D.which

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• 10 ________ you make a promise,you should keep it

  A.Unless

  B.Though

  C.Once

  D.Even if

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