21．―Thanks for the ride home!
―_______
A．Don’t mention it. B．With pleasure.
C．Never mind about that. D．That’s right.
22．It came as_______ surprise that Poland’s President and scores of its top officials were killed in _______ air crash in Russia.
A．不填; the B．a; an C．a; 不填 D．the; an
23．―Why are we supposed to buy that flat?
―Because it’s clean and well-located, but _______ of all, it’s affordable.
A．well B．good C．best D．better
