A. photograph B. knowledge C. celebrate D. government A. fall ill B. backstage C. music class D. show A. policewoman B. participant C. congratulation D. settle down A. advertiser B. achievement C. physical D. department store A. relativity B. Halloween C. host D. produce A. history B. blink C. heading D. historical A. scraper B. snowstorm C. philosopher D. headline A. gymnast B. certificate C. financial D. and A. politics B. brake C. ashamed D. identify A. severe B. painlessly C. physicist D. amateur