A. root B. sense C. constitute D. twenty-one A. program B. grandson C. permanent D. popsicle A. college B. orchestra C. resemblance D. apple A. constitution B. return C. kettle D. rubble A. unique B. pass by C. comedy D. signature A. exchange B. turn around C. impossible D. ninety A. magnesium B. herself C. Chinese New Year D. skating rink A. all year round B. voice C. pack D. heavily A. paradise B. Greece C. diagram D. entertaining A. cooperate B. zinc C. talent D. get the hang of