A. auditory B. turn C. North American D. one A. at present B. immediately C. silly D. risky A. sail B. build sb up C. ocean D. shy A. smartphone B. importance C. instrument D. video A. in the meantime B. zone C. important D. get on A. first floor B. safety rule C. factory D. allow A. return B. key C. lesson D. merchant A. cheongsam B. underline C. guarantee D. musical A. forget B. deserve C. nursery rhyme D. sit down A. umbrella B. older C. likelihood D. shock