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27.Any information sent to us will be held in strict confidence and will entail no obligation ____ your part.

A.on
B.for
C.after
D.into

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28.As you will note in our illustrated price list, our plastic kitchenware is superior to any other ____ the market.

A.on
B.for
C.at
D.under

29.For now, more that 80% of business websites are run via the Internet ____ American firms.

A.of
B.by
C.in
D.out

30.Please charge all the expenses incurred ____ our account.

A.on
B.to
C.for
D.of

31.____ instructions from the importer, we have opened anirrevocable letter of credit for USD5,600 in your favor, valid until January 1, 2005.

A.On
B.From
C.In accordance
D.According

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