二、单项选择（每小题0.5分，20小题，共10分）
11. For a long time they walked without saying ______ word. Jim was the first to break _____ silence.
A. the ; a B. a; the C. a; / D. the ;/
12. It was at the entrance ______ we stood chatting ______ the accident happened.
A. where; that B. which; that C. that; where D. where; which
