30. We regard customer complaints as an opportunity to_________ our service.
A) bring
B) receive
C) improve
D) obtain
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31. We took advantage of its sports facilities________ staying at the hotel.
A) although
B) while
C) until
D) unless
32. It has been decided that Mr. Li will________ the company when the CEO retires.
A) put off
B) call for
C) bring about
D) take over
33. The study shows that some students have difficulty _______long English texts .
A) reading
B) read
C) to read
D) to be read
34.If you __________ your mind, please call me at this number before Saturday.
A) changed
B) would change
C) had changed
D) change