Insert the correct prepositions:
(1) Business letters can be sent... e-mail or fax.
(2) They can be devoted ... various subjects.
(3) As you know our conditions of sale stipulate payment... thirty days.
(4) We have had no reply ... the statement ... account sent to you ... 18th April.
(5) We have not yet received payment... your outstanding balance.
(6) Nor have we received acknowledgement... our letters.
(7) When we telephoned ... 23rd May we were assured. .. Mr Innis that a cheque would be forwarded ... us that day.
(8) We should like to draw your attention ... this fact.
(9) We must insist... receiving payment by 28th June.
(10) We shall have to refer the matter. .. our solicitors.

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