-Hey, Mr. Smith, you are wanted on ______phone.
-who is calling?
- ____Mr. Green. I don't know who he is.
　 A. /; A 　 　 B. the;/ 　 　 C. the; A 　 D. /; /

-Really? Who will give _____lecture? What is it about?
- Professor Chen, ____president of Beijing University. About pollution.
A. the; a 　 　 B. the；/ 　 　 C. a; the 　 D. a; /

 All these changes will lead to _____stronger and powerful China, ____country that can surprise and enrich our planet.
  A. a; a          B. a; the        C. the; a       D. the; the

 _____computer is really _____most useful invention in the twentieth century.
  A. The; a        B. The; /        C. A; /         D. /; a

 Mr. Smith told us that _____gold medal his son had got was considered ____great honor to the whole family.
  A. the; /        B. a; a          C. the; a       D. a; the

 A serious accident happened at ___crossroad, not far from _____New World Supermarket.
  A. /;the         B. a; a          C. the;/        D. a; the

-Do you like your school life?
-It's hard to say. If there were no ____examinations, I should have ____much happier time at school.
A. an; a 　 　 B. /; a 　 　 C. a; the 　 D．/；/

 As ____unemployment is very high at the moment, it's very difficult for people to find _____work.
  A. the；/        B./;/            C. the; a       D. an; the

 It's ____great pleasure to go to ___cinema after a week's hard work.
  A. a; the        B. the; a        C. a. a         D. the; the

 How did you pay the workers? As a rule, they were paid ______.
  A. by an hour     B. by hours           C. by a hour         D. by the hour