26. I'm pleased to receive your letter of April 10th , _________ for our catalogue and price-list.
A. ask
B. asked
C. to ask
D. asking
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27. __________your trip is short or long, we can work out a schedule for you.
A) Whether
B. what
C. how
D. which
28. The project team _________people from different departments of the company.
A. falls into
B. brigs about
C. conists of
D. results from
29. In the survey, we asked the workers about things __________made their work harder to do.
A. what
B. that
C. who
D. this
30. We'd like to make an ________with your manager to further discuss the contract.
A. opportunity
B. influence
C. appointment
D. experiment