What would have happened ________, as far as the cliff?
A. if Bob has walked farther B. if Bob should walk farther
C. if Bob had walked farther D. if Bob walked farther
The 2010 Expo will take place in Shanghai, ________ many countries consider a good chance to introduce their cultures to the world.
A. where B. when C. what D. which
The professor’s research finally proved to be ______, though he had spent a lot of money on it.
A. priceless B. valuable C. worthless D. worthwhile
The purpose of our advertising is to _________ customers’ attention to our product.
A. pay B. devote C. fix D. draw
____ is the ability to do the job rather than where you come from or what you are that matters.
A. It B. That C. This D. There
Parents cannot take care of them ________, so children should learn to be independent.
A. all the time B. at one time C. in no time D. at any time
