A. sky B. item C. subject D. motor neurone disease A. working B. letter C. energize D. each other A. stretch B. Chinese C. with D. community A. catch up B. gorge C. garden D. weekday A. advice B. significant C. boat D. keeper A. tree B. temper C. haven't D. environmentalist A. mysterious B. walk C. evaluation D. host A. clamp B. emergency C. aeroplane D. tyre A. themselves B. black-and-white C. who D. software A. raise B. steady C. over D. analysis