11. By 2000, scientists surely () a cure for this kind of disease.
A. A have discovered B. B must discover C. C are discovering D. D will have discovered
12. He () to write a history of civilization.
A. A set off B. B set in C. C set out D. D set about
13. The rocket went into () round the moon.
A. A track B. B orbit C. C path D. D course
14. - Congratulations! You won the first prize in today''s speech contest. - ( )。
A. Yes, I beat the others B. No, no, I didn''t do it well C. Thank you D. It''s a pleasure
15. A: Could you give me some advice on how to improve my writing? B: ( )。
A. Well, don't worry about it. Writing is a bit difficult. B. Sorry, I don't know. C. You are welcome. D. That's a good idea.