1．________English vocabulary is ________mixture of words from different languages.
A．The; a B．The; / C．/; / D．/; a
2．A good storyteller must be able to hold his listeners' curiosity ________ he reaches the end of the story.
A．when B．unless C．after D．until
3．________in thought, he didn't notice that the teacher was right in front of him.
A．Losing B．To lose
C．Being lost D．Lost
