21．At first, it seemed that everything went well, but all oficeberg.sudden, the ship hit
A．a; an B．a; the C．the; the D．/; an
22．There were some chairs left overeveryone had sat down.
A．when B．that C．until D．where
23．Make sure you’ve got the passports and tickets andbefore you leave.
A．something B．anything C．everything D．nothing
24．With the loud noise going on in the workshop, I can hardlyon my lessons.
A．put B．rely C．concentrate D．center
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