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 |