— I am sorry the traffic is so heavy.
— Does that _______ why you are so late?
| A．settle down |
| B．account for |
| C．get away with |
| D．cut down |
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 |
our earth, or else it will be no longer fit for us to live on.
| A．Protected | B．To protect |
| C．Protecting | D．Protect |