A. brother B. downhill C. a box of D. space A. power B. windowsill C. sad D. limit A. meaningful B. walker C. harp D. station A. winkle B. born C. set free D. inform A. Wild Goose Pagoda B. complication C. hide and seek D. standard A. worried B. communism C. swarm D. machine A. reform B. vicious C. high-rise D. steam A. case B. lecture C. fuel D. foot A. tube B. incompetent C. hoverboard D. definitely A. cardboard B. cute C. grandparents D. engineering