21. ---Something is wrong with my bike. I wonder if you could lend me a hand.
---_______.
A. Take it easy B. No problem C. Help yourself D. It’s my pleasure
22. In the dark street there wasn’t a single person ____Jane could turn for help.
A. that B. who C. from whom D. to whom
23. My careless friend Bob received a ticket for speeding. He ____ have driven so fast.
A. can’t B. wouldn’t C. mustn’t D. shouldn’t