A. taken off B. taken after C. taken in D. taken on 12. ---Are you able to cover 100 meters in 10 seconds? ---_____. A. Yes, it¡¯s a piece of cake! B. That¡¯s all right. C. Yes, it¡¯s a short way. D. You¡¯re welcome. 13. Mr. Smith is coming to Beijing next Sunday. By the time he arrives we ____ here for ten days. A. have been staying B. have stayed C. shall stay D. will have stayed 14. As is known, one of the many benefits of ______ foreign travel is learning how to cope with _____ unexpected. A. the; / B. /; an C. the; the D. /; the 15. ¡°Leaves are to plants ___ lungs are to human beings,¡± the biology teacher said to the students. A. that B. which C. what D. whose 16. While crossing the mountain area, you¡¯d better carry a stick in case you ____ by wild animals. A. should be attacked B. might be attacked C. must be attacked D. would be attacked 17. ---What are the Blacks? ---Mr. Black is a teacher, and his wife is _____. A. the other B. the rest C. another D. other 18. It is the prevention of disease _____ the successful treatment that has led to the rapid increase of the world¡¯s population. A. less than B. rather than C. more than D. better than 19. With the development of modern electrical engineering, we can send power to ___ it is needed. A. however B .whenever C. wherever D. whichever 20. ---Was Tom in the chemistry lab when you arrived there? ---Yes, but he _____ soon afterwards. A. had left B. left C. would leave D. has left