I usually sleep with the window open _____ it’s very cold.
| A．until | B．unless | C．when | D．if |
This road is about .
| A．twenty metres tall | B．twenty metres thick |
| C．twenty metres long | D．twenty metres wide |
Mary lost her bagschool.
| A．on her way to | B．on her way |
| C．in her way to | D．in her way |
is necessary that you start training a few months before the walk.
| A．This | B．That |
| C．What | D．It |
—Is your father a teacher?
—Well, he _______.
| A．used to | B．was used to |
| C．used to be | D．is used to be |
—Do you spend a lot of timecomputer?
—No, but I spend much time doing my homework.
| A．on; in | B．in; on |
| C．on; on | D．in; in |