When a space shuttle has accomplished its _____, it can be ready for another trip in about two weeks.
| A．venture | B．mission | C．commission | D．responsibility |
Color-blind people often find it difficult to _____ between blue and green.
| A．compare | B．separate | C．distinguish | D．divide |
Scientists say it may be five or six years ______ it is possible to test this medicine on human patients.
| A．before | B．after | C． since | D．when |
If you commit a crime, you will ____ punishment.
| A．desire | B．deserve | C．demand | D．desert |
The victims of the accident demanded that the case ______ at once.
| A．would be looked into | B．should look into |
| C．be looked into | D．look into |
We each took ______ tea after having ______ wonderful supper at my aunt’s yesterday.
| A．a; / | B．/; / | C．the; the | D．a; a |