—It's difficult to get to the other side of the river.
—I think a bridge ________ over the river.
| A．should be built | B．should build |
| C．will build | D．has built |
The CD-ROM is designed Nancy Jackson.
| A．of | B．for | C．to | D．by |
---____ levels does the game have? -Five.
| A．How long | B．How many | C．How often | D．How much |
I'm sorry I can't stop with you. I have much work to do.
| A．to talk | B．talking | C．talk | D．talked |
The windows after school is over.
| A．usually close | B．usually closed |
| C．are usually closed | D．are usually closing |
The factory has been closed a year ago.
| A．already | B．since | C．for | D．yet |