20. The flu is believed________by viruses.
A.causing | B.being caused | C.to be caused | D.to cause |
As the twentieth century came to a close, the raw materials for a great national literature were at hand, waiting __________.
A.to use | B.to be used |
C.to have used | D.to be using |
If you think that treating a woman well means always __________ her permission for things, think again.
A.gets | B.got |
C.to get | D.getting |
The wild flowers looked like a soft orange blanket __________ the desert.
A.covering | B.covered |
C.cover | D.to cover |
AIDS is said __________ the biggest health challenge to both men and women in that area over the past few years.
A.that it is | B.to be |
C.that it has been | D.to have been |
— I was wondering if we could go skiing on the weekend.
— __________ good.
A.Sound | B.Sounded |
C.Sounding | D.Sounds |