21. He is the person ______, I believe, has the ability to do this challenging job.
A. who B. whom C. him D. which
22. The new project referred to in the meeting is not as challenging as _______ the professors had carried out last year.
A.what B. when C. which D. how
23. What is the way the poor man thought of ________ enough money to buy the lorry?
A. getting B. having got C. to get D.to getting
24. Is this poet ______ poem we read aloud last week in our English class?
A. where B. the one that C. in which D. the one whose
