A. tractor B. apple C. prompt D. computer A. word B. tool C. sharpen D. spelling A. eminent B. can C. carbon dioxide D. billion A. in B. keyboard C. beeswax D. dinghy A. need B. piece C. tune D. safely A. civilization B. adapt to C. many D. difficult A. employment B. cycling C. green D. me A. if B. century C. screen D. cut up A. dinosaur B. type C. make a decision D. eyewitness A. rid of B. collapse C. see D. by school bus