A. faulty B. officer C. flat D. ratio A. because of B. deliver C. critical D. product A. take care B. manner C. insurmountable D. point A. pond B. biology C. bullfight D. flight A. exactly B. quite C. thorough D. homeless A. Beijing Opera B. part C. stupid D. order A. direct B. greeting C. giant D. headlight A. dragon boat B. immune C. jacket D. acquisition A. overcoat B. penguin C. leg D. succeed A. have a toothache B. sir C. volcanologist D. twelve