A. barrier B. conservation C. downstairs D. misunderstanding A. someone B. sensitive C. ablaze D. at once A. doesn't B. promontory C. hurt D. floor A. dinghy B. conscience C. sentence D. ow A. caution B. immortal C. empty D. X-ray A. share B. unless C. usual D. back A. at work B. in spite of C. nest D. stand up A. against B. fall C. engineer D. vitamin A. don't B. knife C. describe D. analysis A. accuse of B. address C. disco D. qualification