21． He made rapid progress in English, which I was amazed ___________.
A. on B. at C. in D. about
22. Who was the first person to reject the idea ______ the earth was the centre of the universe?
A. when B. why C. where D. that
23. With so many people communicating in English every day, ________ will become more and more important to have a good knowledge of English.
A. it B. which C. that `D. what
24. I lost sight of Wang Ping when we reached _______ looked like a large market.
A. that B. were C. where D. what
25. It is only if you ask many different questions that _________ acquire all the information you need to know.
A. you will B. will you C. can you D. you should
