一. 单项填空 (共20题, 每题1分, 满分20分)
21. As is known to all, ____ People's Republic of China is ____ biggest developing country in the world.
A. the; 不填 B. 不填; the C. the; the D. 不填；不填
22. Professor Williams keeps telling the students that the future _____ to the will-educated.
A. belongs B. is belonged C. is belonging D. will be belonged
23._____is known to us is that the 2016 Olympic Games _____ in Rio, de Janeiro, Brazil.
A. What; are going to be held B．It; will hold
C. As; is held D. What; is going to be held
24. I bought a dress for only 10 dollars in a sale; it was a real ______.
A. exchange B. bargain C. trade D. business
25. The villagers went out to the mountain _____ the missing child.
A. to search B. in the search of C. searched for D. in search of
26. As your instructor advised, you ought to spend your time on something ______ researching into.
