A. ten B. climber C. article D. playground A. stick to doing sth B. amazing C. moth D. recuperation A. method B. potato C. dam D. ironically A. abstruse B. archaeologist C. cow D. skeptical A. let B. keep a secret C. crowded D. abject A. the Palace Museum B. rely C. fat D. mask A. pounce B. gold C. rise D. function A. incompetent B. reporter C. lift off D. safely A. heaven B. ransom C. cut D. cupboard A. NASA B. backache C. clutter D. train