21．—I’m sorry, but there’s no smoking on this flight.
—Oh, I that. Sorry, I won’t again.
A. don’t know B. didn’t know C. won’t know D. haven’t known
22．It is no longer a question man is learning more and more about space.
A. whether B. that C. if D. how
23．—Do you think they have as many books as they’ve described?
—Well, in my opinion, they have few books, if .
A. some B. any C. none D. many
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