19.I　don’t　think　we’ve　met　before.　You’re　taking　me　for　 　　　. 　　A.　some　other　　　 B.　someone　else　　 C.　other　person　　　 D.　one　other 20. -Shall　we　go　to　the　art　exhibition　right　away?

　 -　　　　　

　A. It’s　your　opinion　　　　　 　B.　I　don’t　mind　

　C.　It’s　all　up　to　you　　　　　　 D　That’s　your　decision

18. _______ in the mountains for a week, the two students were finally saved by the local police.

　A. Having lost　　　 B. Lost　　　　　 C. Being lost　　　 D. Losing