Since most Antarctic rocks are dark in color, they stood out _____ the white background and are easy to identify and collect.
| A．against | B．on | C．beyond | D．above |
There _____ a dictionary and several books on the desk.
| A．are | B．must | C．have been | D．is |
What she says and does _____ nothing to do with me.
| A．was | B．were | C．has | D．have |
Every possible means _____ .
| A．has tried | B．has been tried |
| C．was tried | D．were tried |
When ______ the United Nations founded?
| A．is | B．are | C．was | D．were |
In my opinion, some of the news _____ unbelievable.
| A．are | B．is | C．has been | D．have been |