A. windowsill B. backpack C. sleep D. ending A. still B. over again C. reliable D. snowy A. promise B. second C. trail D. thrill A. concoct B. ill C. food for thought D. compare with A. drill B. heaven C. scrape D. inform A. claw B. desertification C. debt D. kill A. tongue B. according to C. skill D. plane A. desolate B. pass by C. hill D. joke around A. on the way B. skeleton C. horse D. landfill A. by subway B. will C. farthest D. flashlight