9. _____ all behavior is learned behavior is a basic assumption of social scientists.
| A．Nearly | B．That nearly | C．It is nearly | D．When nearly |
Living things are dying out quickly. Let’s ask ____ destroying them in the past years.
| A．what part people have been playing |
| B．people have played in |
| C．what part people have played in |
| D．people have been playing what part |
The man who was being followed stopped from time to time ____ he wanted to tie his shoelaces.
| A．as if | B．like | C．what | D．as |
____ he was fired by the company is ____ he didn’t work hard.
| A．What; because | B．Why; because | C．Why; that | D．That; because |
It is well known to us all ____ China sent up a manned spaceship to outer space successfully last year.
| A．that | B．what | C．which | D．when |
The players expected there ____ more free time before coming back to the country from abroad.
| A．is | B．being | C．have been | D．to be |