1.We deal in decorative fabrics ____ different varieties.
A. on
B. of
C. in
D. for
2. Prices of vegetable oils have risen steeply ____ last May.
A. for
B. since
C. before
D. in
3.We should be pleased to send you a sample ____ our own expense.
A.at
B.in
C.against
D.of
4.The letter we received yesterday is an inquiry ____ discounts.
A.for
B.after
C.before
D.unless
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