单项选择题

The police still haven' t found her, but they' re doing all they （）

A. may
B. can
C. must
D. will

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Nobody but Jane ______ the secret.

A. know

B. knows
C. have known

D. is known

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The issue is how to ______ of radioactive waste.

A. deal
B. dispose
C. disposal
D. do

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