A. prevent B. taxi C. heath D. ping-pong A. racial B. subway C. radio astronomer D. watch out A. key B. particle C. coach D. liner A. unclear B. plane C. twentieth D. nowhere A. racing car B. jeep C. ship D. calm A. confusing B. hold onto C. bike D. German A. colourful B. wife C. lose one's way D. junk A. lorry B. actually C. product D. butter A. bicycle B. overwhelm C. guilty D. pronounce A. rugged B. say thanks to C. boat D. effortlessly