__________of danger in the street at night, she had to go home, with a friend_________ her.
| A．Warned, followed | B．Warning, following |
| C．Having warned, following | D．Having been warned, following |
When the woman was told that her husband had a car accident, her mind _____.
| A．ended up | B．made sense | C．blocked out | D．went blank |
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 |