A. stack B. whimsical C. keep up with D. aeroplane A. high school B. lava C. swimming D. junk A. habitat B. stick to C. ship D. tiring A. let out B. lorry C. play jokes on D. grain A. taxi B. decision-making C. proportion D. cheese A. brimful B. west C. lead D. car A. bike B. flashback C. nervous D. good evening A. ironically B. plane C. hasn't D. traffic light A. Benz B. safety rule C. motorcycle D. trip A. Children's Day B. smartphone C. boat D. slow