21. — Do you think advertisement is _______ help when you look for a job.
— Well, it depends. Anyway, it gives me more of_______ chance to try.
A. a; a B. a; the C. the; the D. /; /
22. The editor-in chief asked me to write an article for him, ______ about AIDS patients in China.
A. that B. one C. it D. this
23. The place _______ the bridge is supposed to be built should be _______ the cross river traffic is the heaviest.
A. which; where B. at which; which C. at which; where D. which; in which
