---- Did Mary come to the party?
---- I don’t know. She _____ while I was out.
A.might have come | B.might come | C.should have come | D.must have come |
The company earned a lot of money. As a result, the members’ personal income rose by a/an __ of 13 percent.
A.average | B.ordinary | C.common | D.usual |
With the help of high technology, more and more new substances ___in the past few years.
A.discovered | B.have discovered |
C.had been discovered | D.have been discovered |
It was dark. We decided to ___for the night at a farmhouse.
A.put down | B.put up | C.put away | D.put on |
They would __if food was difficult to find, so they celebrated when they had food.
A.kill | B.disappear | C.starve | D.start |
It was the woman ___had been in prison __stole the money.
A.who; where | B.that; how | C.who; who | D.that; where |