He made a serious mistake, but he took action to change that _________ it got worse.
| A．until | B．when | C．because | D．before |
Learning to write is learning to think. You don’t know things clearly _______ you can write them down.
| A．unless | B．if | C．since | D．whether |
I thought the actor was famous, _________ none of my friends has ever heard of him.
| A．and | B．or | C．so | D．but |
Many children in Britain _______ to have their own bank cards these days.
| A．allow | B．allowed | C．are allowed | D．were allowed |
Last winter it was very cold and ________ was a lot of snow in the north.
| A．it | B．this | C．that | D．there |
David Burt’s dream in China is to go into the west and ______ an early childhood school there.
| A．clean up | B．look up | C．give up | D．set up |