Questions and exercises are given by the computer, which decides ______ to move the students ahead, review an easier level, ____ give more work on the same level.
| A．either, or | B．both, and . | C．whether, or | D．not only, but also |
Silk ________ in _______ China.
| A．produce, the southeast | B．is produced, southeast |
| C．is grown, southeast | D．is produced, the southeast of |
_______ it goes on, hour ________ hour.
| A．So, after | B．Such, by | C．That, after | D．/ by |
The headmaster _________ a noisy boy from the library.
| A．sent for | B．sent out | C．sent back | D．sent away |
There is ________ today's newspaper.
| A．nothing new in | B．something new on |
| C．important something in | D．nothing important on |
_______ a cold morning, I opened the window and was glad to find that It was snowing
outside.
| A．By | B． In | C．At | D．On |