According to the ______, it has been done.
A. contract
B. spilled
C. discharge
D. infer
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Who will ______ the declaration of security?
A. agree
B. sign
C. take
D. board
There is a ______ between them.
A. different
B. difference
C. vary
D. distant
This is ______ we should do.
A. who
B. what
C. which
D. where
Will this ______ fresh water supply on board?
A. related
B. permmit
C. affect
D. effect