Don’t turn on the radio __________ your mother allows you.
| A．unless | B．because |
| C．if | D．and |
---How can you use my computer without my permission?
---Oh, I ________to tell you. I hope you don’t mind.
| A．forget | B．forgot | C．had forgotten | D．am forgetting |
The school is no longer what it was 20 years ago, _______it was so poorly equipped.
| A．when | B．which | C．since | D．where |
._________alone in the large house, the little boy had to learn to survive by himself.
| A．To leave | B．Leaving | C．Left | D．Being left |
---Can I use the telephone on the table, sir?
---Under no circumstances___________the telephone in the office' for personal affairs.
| A．anyone is allowed to use | B．anyone is allowed using |
| C．is anyone allowed to use | D．is no one allowed using |
.__________having hundreds of online "friends" is great, our real and closest connections still lie with those who are a part of our daily lives.
| A．As | B．Once | C．While | D．When |