21.—I’ll do the washing-up. Jack, would you please do the floors?
A．Yes, please B．No, I don’t C. Yes, sure D. No, not at all
22.There are over 58, 000 rocky objects in _______ space, about 900 of which could fall down onto _______ earth.
A．the; the B. 不填; the C．the; 不填 D．a; the
23.Jim went to answer the phone. _______, Harry started to prepare lunce.
A. However B. Nevertheless C. Besides D. Meanwhile
24.Joseph ______to evening classes since last month, but he still can’t say “What’s your name?” in Russian.
A．has been going B．went C．goes D．has gone