A. introduction B. Signor C. mask D. graceful A. intellectual B. kilogram C. water D. likelihood A. carving B. get along C. one-to-one D. amber A. disease B. mid C. give sb a hand D. eat out A. one another B. try out for C. background D. mantis A. optimism B. in peace C. blood D. crowded A. promise B. ashamed C. bulletin D. task A. Olympic Games B. primary C. scrape D. clavichord A. organism B. impending C. prize D. border A. backward B. glisten C. charity D. outing