Since then the number of people taking driving lessons ________ 20％.
| A．has increased to | B．increases by | C．has increased by | D．have increased by |
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 |