21. He ____________ his old car for a new one as soon as he had won the prize.
A. replaced B. converted C. exchanged D. interchanged
22. He is a very _______________ character; he is never relaxed with strangers.
A. serf-confident B. self-conscious C. self-evident D. self-serving
23. You’ll find that the community has _____________ great changes since you were here last time.
A. submitted B. sustained C. perceived D. undergone
24. You don’t have to ___________ yourself. I think you did the right thing putting your mother in a nursing home.
A. justify B. hinder C. indulge D. appoint
25. If prisoners behave well they are allowed the ___________ of visiting their families at the weekend.
A. equality B. security C. privilege D. prestige
