We are sparing no efforts to create _____ more peaceful and more advanced world, ______ place where everyone enjoys his life and freedom.

A. the; a                B. /; the                      C. a; a                       D. the; the  

President Hu Jintao left Beijing on Monday, April 12, 2010, on_____ 10-day, four-nation trip to attend______ Nuclear Security Summit in Washington.

 A. a; the                 B. the; the             C. a; a           D. the; a

It is reported that ________ European chemist called Felix Hoffmann first produced ASA which completely changed ________ man’s understanding of aspirin.

A. a; /                                 B. an; a                        C. the; a                       D. an; /

We work together to achieve our common purpose： ______ world that is safer, cleaner and healthier than______ one we found．

A．the；the        B．a(chǎn)；不填       C．a(chǎn)；the      D．the；不填

If I drive in this city myself, I’ll probably get lost because I haven’t got ___ good sense of ___ direction. 

A. a; 不填                B. the; 不填               C. a; the             D. the; a

. We set off early ____ next morning and came to ____ unknown valley after about an hour.

A. the; the   B. the; an   C. /; a    D. /; the

We have every reason to believe that ______ 2010 World Expo in Shanghai will be ______  success.

A. /; a                         B. the; /                 C. the; a              D. a; a

Dina El-Mogazi, ____ director of _____ Campus Greening Department, says courses in ____ variety of disciplines(科目)will achieve the requirement.

    A./;the;/    B.the;/;a    C./;the;a    D.the;the;the

Our New Year party was _____ success. We sang and danced until it came to _____ end at 10 o’clock.

A. a; the           B. a; an            C. the; an               D. /; the

—Great changes have taken place in ________ Zhenjiang.

—Definitely. Zhenjiang is no longer ________ it used to be.

A. the; 不填              B. 不填; what                  C. 不填; which          D. the; that