The man is____ a serious nervous breakdown because he is unable to deal with pressure from daily life.
| A．at the edge of | B．on the edge of | C．on behalf of | D．on the top of |
Willpower is a kind of quality, ________ is ________ it takes to do anything well.
| A．what; which | B．what; what |
| C．which; which | D．which; what |
________ nearly all behavior is learned behavior is a basic assumption ________ has been put forward by social scientists.
| A．What; that | B．That; what |
| C．What; what | D．That; that |
The British are not so familiar with different cultures and other ways of doing things, ________ is often the case in other countries.
| A．that | B．who |
| C．where | D．as |
________ some students are not aware of is ________ difficult life can be if they are not devoted to study.
| A．That; how | B．Which; what |
| C．What; what | D．What; how |
________ you are supposed to do ________ you don't like a thing is change it. Don't complain.
| A．That; why | B．What; when |
| C．What; where | D．That; how |