17.As mentioned ____ my letter of August 6, the shoes were not satisfactory.
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18.The goods will be shipped ____ October 1.
A.in
B.to
C.on
D.with
19.We will write ____ you as soon as we are able to supply these goods again.
A.until
B./
C.while
D.as
20.Please try your best to ship our order ____ that steamer.
A.by
B. for
C.in
D.with
21.As earlier discrepancies were accepted by the L/C applicant ____ writing, we request you to effect payment without delay.
A.in
B.to
C.on
D.with