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單項選擇題

You must（）in this area unless you have messages about the casualty.

A.keep radio silence
B.keep radio silent
C.keep radio be silent
D.keep silent the radio

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單項選擇題

You shall（）this letter so as to signify your acknowledgement of the responsibility.

A.make out
B.submit
C.produce
D.endorse

單項選擇題

You should not divide the fresh water（）three trips.

A.in
B.into
C.to
D.for