A. save B. wood C. backwater D. one by one A. gray B. torrent C. put up D. mathematical A. skating B. mooncake C. Greenwich D. wife A. bounce B. socks C. hit D. revision A. by coincidence B. football field C. rabbit D. cemetery A. surprise B. power line C. bund D. skill A. soft toy B. result in C. sang D. forget A. debate B. a lot C. illegal D. a little A. milestone B. side C. prejudiced D. ballad A. hover-train B. from then on C. go back to D. meaningful