She ____ on her homework in her study now .
| A．must work | B．can work | C．must have worked | D．must be working |
He made a living ___ teaching.
| A．with | B．by | C．to | D．over |
She was _____ for helping the murderer to escape.
| A．searched | B．brought | C．arrested | D．determined |
To keep the town clean, the truck ____ garbage is prevented ____ entering the town.
| A．loaded with; 不填 | B．loading with; from |
| C．loaded of; from | D．loading of; 不填 |
I rely ____ her to pay back the money.
| A．to | B．for | C．on | D．at |
Waste paper, waste glass, and waste iron can all be _____.
| A．made | B．taken | C．recorded | D．recycled |