A. topography B. riding C. enjoyable D. the Opera House A. analytical B. sensation C. calm down D. cheaply A. P.E B. to be honest C. headset D. hover-train A. come about B. expedition C. downhill D. NASA A. come to an end B. physicist C. Sydney Opera House D. meanwhile A. ring B. trickle C. impersonal D. magical A. mate B. Mother's Day C. tableland D. conjuring A. yeast B. rock C. exceptionally D. erode A. porcupine B. fall C. at the end of D. adorn A. hovercraft B. popcorn C. draw up D. painting