My mother _________ a history teacher.
| A．used to being | B．is used to being |
| C．used to be | D．is used to be |
Look at the ______, sir. The white shirt is larger than the yellow one.
| A．shirt | B．size |
| C．weight | D．colour |
The red suitcase is expensive ______it’s made of leather.
| A．when | B．if |
| C．because | D．though |
Could you show me how to ________ this new recorder?
| A．operate | B．listen |
| C．look | D．learn |
Some people think that CD-ROMs will soon be _________ books.
| A．as more popular as | B．the most popular than |
| C．so popular as | D．more popular than |
I didn’t _____ you were going to leave_____ 3 o’clock.
| A．find; at | B．realize; until |
| C．remember; before | D．tell; after |