I ________it as a basic principle of the company that suppliers of raw materials should be given a fair price for their products.
| A．make |
| B．look |
| C．take |
| D．think |
You can easily _______ this question if you study British history.
| A．clarify | B．classify |
| C．clear | D．circulate |
It was _________ to everybody that he was angry.
| A．regular | B．special |
| C．generous | D．apparent |
Whenever I get into trouble, I always _______ Peter.
| A．carry on | B．count on |
| C．turn on | D．move on |
At minus 130℃, a living cell can be _________ for a thousand year.
| A．spared | B．protected |
| C．preserved | D．developed |
Earth is believed ______ by an object the size of Mars at some point in the distant past before itssurface cooled.
| A．to be hit | B．to have hit |
| C．to have been hit | D．to hit |