30.If Mary had the situation to Tom, he would have understood it.
A. supplied
B. explained
C. charged
D. thrown
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31. 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
32. _________your trip is short or long, we can work out a schedule for you.
A. Whether
B. What
C. How
D. Which
33.The project teampeople from different departments of the company.
A. falls into
B. brings about
C. consists of
D. results from
34.In the survey, we asked the workers about thingsmade their work harder to do.
A. what
B. that
C. who
D. this