A. sit down B. race C. take D. excuse me A. electronic B. pen C. train station D. free A. at once B. emigrate C. post office D. combine A. indigo B. then C. drive D. railway station A. excavate B. busman C. frequent D. turn A. zoo B. tidy up C. complication D. familiarity A. primary B. rat C. affectionate D. park A. wound B. did C. see the doctor D. bus stop A. ran B. bus C. outlaw D. schoolbag A. ecosystem B. in a row C. lake D. hope