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All the information offered by you will be kept ____ confidential.

A. in
B. as
C. to
D. with

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We are enclosing a full set of copy documents ______this first consignment

A. referring
B. covering
C. regarding to
D. as for

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Please inform us ____ the supply and demand situation in your country.

A. to
B. of
C. with
D. in