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C. reject
D. return
10.We also wish to advise you that the prices we quoted are our ___________ prices.
A. new
B. cheap
C. rock bottom
D. easiest
11.We thank you for attending ___________ our request so promptly.
A. with
B. upon
C. to
D. at
12.The time of waiting for payment agreed upon by both sides is the period of ___________.
A. shipment
B. letter of credit
C. draft
D. credit
13.We have been happy to ___________ your credit based on your promise to pay according to our terms.
A. expand
B. prolong
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