—I"m not sure _________there are living things on the planets or not.—Even scien

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—I"m not sure _________there are living things on the planets or not.
—Even scientists aren"t sure about it.[     ]
A. whether
B. where
C. why
D. what

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举一反三

—Did you have a good time at Alice"s birthday party？
—Yes，indeed. It’s several years_____ I enjoyed myself so much.[     ]
A. when
C. since
B. before
D. that

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It"s quite common in Britain to Say "Thank you" to the drivers ________ people get off thebus.[     ]
A. after
B. since
C. until
D. when

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_________ he is ill, _________ he goes to school. [ ]
A. Although, but
B. /, /
C. Although, /
D. But, although

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I didn"t understand the whole (整个的) thing _______ she told me the secret(秘密).[     ]
A. until
B. when
C. after
D. because

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"You can"t have this football back _____ you promise not to kick it at my cat again. " the old man said
angrily. [ ]
A. because
B. since
C. when
D. until

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