A. population B. brain C. wandering D. receptionist A. get used to B. sphere C. be born with D. lighter A. previous B. enlightened C. look back at D. aloud A. make friends B. unit price C. pal D. waiter A. knowledge B. amazement C. break into D. puzzle A. secret B. list C. diversity D. fanciful A. exclusive B. call for C. safety rule D. connect with A. partner B. infectious C. on the way D. import A. bad-tempered B. carbonated C. pronunciation D. till A. motivation B. distinction C. lifelong D. bullion