A. partridge B. sad C. explorer D. silver A. orchestra B. connect C. no talking D. necklace A. bring B. be made of C. mission D. e-friend A. master B. photography C. shell D. protein A. learner B. planet C. speed up D. hurt A. assistant B. popular C. scarf D. altitude A. Sunday B. everywhere C. the Dragon Boat Festival D. agent A. trip B. reuse C. biochemistry D. band A. thither B. unpaid C. test D. hole A. sleeper B. cooperation C. worse D. watch out