21．They must have been enjoying themselves there, otherwise they so long.
A．can’t have stayed B．wouldn’t have stayed
C．needn’t have stayed D．couldn’t stay
22．The sale usually takes place outside the house ,with the audience on benches ,chairs or boxes.
A．having seated B．seating C．seated D．having been seated
23．The Minister or France stresses that the quality of goods, the quantity of production ,is the key to improving the nation’s economy .
A．other than B．rather than C．more than D．better than
24．The continuous rain the harvesting of the wheat by two weeks.
A．set back B．set off C．set out D．set aside
25．Ted couldn’t remember the exact date of the hurricane ,but he knew it was Saturday because everybody was at church.
A．/; the B．a; / C．/; a D．the; /
26．If you want to do the experiment again ,you’d better be more careful you made a mistake.