We regard customer complaints as an opportunity to _____ our service.
A. bring
B. receive
C. improve
D. obtain
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We took advantages of its sports facilities ______ staying at the hotel.
A. although
B. while
C. until
D. unless
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
The study shows that some students have difficulty _____long English texts.
A. reading
B. read
C. to read
D. to be read
If you ______your mind, please call me at the number before Saturday.
A. changed
B. would change
C. had changed
D. change