He paid for a seat, when he ______ have entered free.
A.could | B.would | C.must | D.need |
So difficult it to work out the problem that I decided to ask Tom for advice.
A.I did find | B.I have found | C.did I find | D.have I found |
The rescue workers were working around the clock, ________ supplies to Yushu Qinghai Province after the earthquake.
A.to send | B.sending | C.having sent | D.to have sent |
After the earthquake, the first thing the local government did was to provide for the homeless families.
A.accommodation | B.occupation | C.equipment | D.furniture. |
________ this cake, you'll need 2 eggs, 175 g sugar and 175 g flour.
A.Having made | B.Make | C.To make | D.Making |
Although the causes of cancer ________, we do not yet have any practical way to prevent it.
A.have uncovered | B.have been uncovering |
C.are uncovering | D.are being uncovered |