The company was brave enough to _______ the customer's complaint.
A. reply
B. respond
C. respond to
D. imply
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He travelled _______ North China _______ South China last month.
A. from...to...
B. in...in...
C. from...until...
D. to...to...
People find it very _______ if their complaints are just ignored.
A. annoy
B. annoying
C. annoyed
D. annoys
It is more _______ to complain by email rather than having to write a letter.
A. convenience
B. convenient
C. much convenient
D. conveniently
The firm had a lot of _______ customers, which is one of the reasons it went bankrupt.
A. satisfy
B. satisfied
C. dissatisfy
D. dissatisfied