Learn to think ________ we are young, or we may never learn. [ ]A. duri

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Learn to think ________ we are young, or we may never learn.      [     ]
A. during
B. when
C. before
D. after

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举一反三

My brother and I look different ________ we are twins.       [     ]
A. unless
B. as
C. though
D. because

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I have been trying my best to study English ________ I want to have a chance to be a volunteer for the Beijing Olympics.       [     ]
A.until
B. because
C. though
D. when

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I will never forget that terrible accident ________ it happened so long ago.      [     ]
A. only if
B. even though
C. only when
D. ever since

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We have been good friends ________ we joined the same ping-pong team.     [     ]
A.after
B. before
C. since
D. until

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He met many problems ________ he was going over his lessons.       [     ]
A. before
B. as soon as
C. since
D. while

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