Scientists say it may be five years ______ it is possible to test this medicine on human patients．
| A．since | B．until | C．before | D．when |
--What are you going to do this afternoon?
-- I am going to the cinema with some friends. The film _______ quite early, so we __________ to the bookstore after that.
| A．finished; are going | B．finished; go |
| C．finishes; are going | D．finishes; go |
It was a time_______ the killer whales helped the whalers catch the baleen whales.
| A．when | B．that | C．then | D．which |
The most important thing about cotton in history is ______part that it played in _______Industrial Revolution.
| A．∕；∕ | B．the；∕ | C．the; the | D．a; the |
We were when we heard of the news that the plane was crashed in the storm.
| A．shocking | B．shocked | C．worried | D．worrying |
After the new technology was brought in, the factory producedcars in
1999 as the year before.
| A．as twice many | B．as many twice | C．twice as many | D．twice many as |