21. There’s only ten minutes left. We can’t wait any longer, __________, we should start at once.
A. what’s more B. in a word C. in other words D. in the end
22. I look forward every day to____________.
A. hearing from you B. hear from you C. heard from you D. be heard from you
23.Which do you prefer, playing cards at home or __________ a walk in the park?
A. to take B. taking C. take D. to have taken
24. ---Where is Jane?
---She _________ on the playground.
A. has played B. is playing C. played D. plays