There is a great deal of research ___that music activities engage different parts of the brain.
| A．indicate | B．indicating | C．to indicate | D．to be indicating |
There is a limit __________ people's life, but no limit __________ the knowledge.
| A．on; to learn |
| B．to; to learn |
| C．on; learning |
| D．to; to learning |
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 |