Many students insist that the choice of their courses and universities ______ their own interest.
| A．be based on | B．base on |
| C．be basing on | D．base at |
—Is the experiment easy?
— ________ . I’ll just do my bit.
| A．I think so | B．Certainly | C．Not a little | D．Anything but |
Apples are usually sold by ________ weight and eggs are sometimes sold by ________ dozen.
| A．the; the | B．/;a | C．/; the | D．the; a |
.---Will someone go and get Mr. Black?
---He’s already been ___.
| A．asked for | B．sent for | C．called for | D．looked for |
__ with such great difficulty, Jack felt at a loss ___.
| A．Facing; what to say | B．Faced; what to say |
| C．Having faced; how to tell | D．Being faced; how to speak |
—Sir, I’d like to take a week’s holiday.
—____. We’ re too busy now.
| A．Forget it | B．Don’ t mention it | C．Don’t worry | D．Pardon me |