Marry always seems nervous in public. Maybe she ________ confidence to talk to strangers.
| A．enjoys | B．rejects | C．lacks | D．destroys |
Unfortunately, the research was limited __________ increasing economic profits，__________ protecting the environment.
| A．to; other than |
| B．by; rather than |
| C．to; rather than |
| D．by; more than |
They are trying to find a new way to __________ the spread of AIDS.
| A．keep |
| B．delay |
| C．catch |
| D．arrest |
They will have you __________ if you don't pay taxes, because it is everyone's duty to pay taxes.
| A．arrest |
| B．arrested |
| C．to be arrested |
| D．being arrested |
She was __________ for helping the murderer to escape.
| A．searched |
| B．brought |
| C．arrested |
| D．caught |
There are so many viruses on the Internet. If __________ accidentally, the viruses may make your computer break down.
| A．downloading |
| B．to be downloaded |
| C．downloaded |
| D．being downloaded |