21. All of _____ sudden, I caught ______ sight of my teachers and classmates in the crowd, and then I felt much more calm.
A. a; / B. /; / C. a; a D. /; a
22. – Is she British or American?
– I don’t know that for sure. But her ___________ indicates the she may come from America.
A. voice B. expression C. accent D. appearance
