Finding information in today’s world is easy．The ________ is how you can tell if the information you get is useful or not．

A．ability

B．competition

C．challenge

D．knowledge

Great as Newton was, many of his ideas ________ today and are being modified by the work of scientists of our time．

A．are to challenge

B．have challenged

C．are challenging

D．have been challenged

I don’t care about the good salary offered by the company．What I need is a(n)________ post．

A．creating

B．awarding

C．challenging

D．competing

The ages of the athletes who will take part in the Asian Games are 21 ________．

A．on average

B．in common

C．in general

D．as usual

Without electronic computers, much of today’s advanced technology ________．

A．will not have been achieved

B．have not been achieved

C．would not have been achieved

D．had not been achieved

Their play ________ great success and brought in a large profit to the theatre．

A．appreciated

B．achieved

C．expected

D．seized

No wonder she is ill! She eats ________ nothing．

Which of the following is wrong?

A．next to

B．close to

C．similar to

D．almost

Usually children are allowed to ________ when they are six years old．

A．attend school

B．attend the school

C．join school

D．join the school

You can ________ us in the discussion if you ________．

A．take part in; hope so

B．join in; want to join

C．attend; want to

D．join; wish to

Although he knew little about the large amount of work done in the field,he succeeded ________ other more well informed experimenters failed．

A．which

B．that

C．what

D．where