21 —How do you find that Beatles’CD?
—Wonderful. It’s well worth ______.
A. to listen to B. listening to C. to be listened to D. being listened to
22. I don’t think the chair can take your weight; it’s _____ children.
A. traded with B. referred to C. connected to D. intended for
23. The city government is planning to start a(n) ________ against smoking in public.
A. competition B. campaign C. battle D. argument
