A. plus B. gentleman C. at once D. whoops A. boarding B. demanding C. urban D. back A. volleyball B. X-ray C. appropriate D. lose heart A. hurt B. on sale C. mooncake D. unshakable A. outlet B. twice C. fair D. sure A. be short of B. overtake C. look ahead D. pence A. help B. twelve C. conceal D. concern A. the greenhouse effect B. defend C. slip D. all the best A. leave B. break out C. pity D. next time A. dawdle B. vase C. ow D. fade