Your firm has been recommended to us by AMK company, （） we have done business for many years.

单项选择题We find （）necessary to stress the importance of making punctual shipment within the validity of the L C.

A.how
B.that
C.it
D.us

单项选择题We regret （） that we can’t accept your offer.

A.of saying
B.for saying
C.about saying
D.to say

单项选择题（） quality and prices are satisfactory, there are prospects of good sales here.

A.Provided
B.Even
C.Though
D.Unless

单项选择题The company in question does steady export business, （） satisfactory results in overseas markets.

A.show
B.to show
C.showed
D.showing

单项选择题The bigger your audience,（） complicated communication channel choice becomes.

A.more
B.it is more
C.the more
D.the most