I didn"t know he came back______ I met him in thestreet. [ ]A. since

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I didn"t know he came back______ I met him in thestreet.   [     ]
A. since
B. when
C. until
D. after

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举一反三

______ the girl is young, she can make money herself.   [     ]
A. Although
B. Since
C. Even
D. If

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My dog has been lost for two weeks _______ it left home.[     ]
A. when
B. while
C. until
D. since

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______ he is very young,_____ he knows much.[     ]
A.Although;but
B.Although;
C.;because
D.As;

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       you have a map of Shanghai, you will get lost easily.[     ]
A. Although
B. Because
C. If
D. Unless

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I"m different from my twin sister. I love dancing, ________ she is interested in singing.[ ]
A. so
B. or
C. yet
D. and

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