We have been good friends ________ we joined the same ping-pong team. [

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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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举一反三

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

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I won"t take part in the party ________ Joe invites me.       [     ]
A.if
B. when
C. unless
D. because

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Tom wants to be a professor when he _________.[     ]
A. grow up
B. growing up
C. grows up
D. grew up

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He was so tired that he fell asleep ___he went to bed.  [     ]
A. as if
B. even though
C. ever since
D. as soon as

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What do you do when it ___?
A. snowing
B. snow
C. is snowy
D. is snow

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