12.Direct steamers to your port are few _____ the winter season.
A.but
B.yet
C.with
D.during
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13.It is possible to extend this Letter of Credit, whichexpires ____ January 28.
A.on
B.in
C.at
D.for
14.We have to hold you ____ your contract.
A.for
B.at
C.to
D.in
15.You may count ____ our full cooperation in the settlement of this matter.
A.for
B.of
C.on
D. /
16.Contracts must be renewed one week ____ their expiration.
A.on
B.against
C.the moment of
D.before
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