The flu is believed________by viruses that like to reproduce in the cells inside the human nose and throat.
| A．causing | B．being caused |
| C．to be caused | D．to have caused |
Don't _____ the news to the public until we give you the go-ahead (许可，准许).
| A．release | B．discard | C．relieve | D．retain |
If you _____ your demand, then maybe you will have more chance of getting what you want.
| A．conduct | B．dismiss | C．grant | D．moderate |
His _____of the aeroplane was correct in every detail and could really fly.
| A．shape | B．pattern | C．design | D．model |
The open university was started in order to help those who _____ having a university education when they were young.
| A．stopped | B．failed | C．missed | D．ceased |
The magician picked several persons from the audience and asked them to help him with the performance.
| A．by accident | B．on occasion |
| C．at random | D．on an average |