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Smoking is forbidden in the workshop, please stop it. Sorry, I（）

A.am not sure
B.have no idea
C.do know
D.did not know

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單項選擇題

Smoking is bad for your health. So, please（）

A.give it up
B.give it in
C.give it out
D.give it away

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Singing these songs, I could not help（）the good old days.

A.thinking over
B.thinking out
C.thinking of
D.thinking up