A. master B. railway station C. horizon D. preserve A. conceal B. scratch C. sea level D. dispute A. orchestra B. bomber C. exhibit D. zebra A. wreck B. pitfall C. narrow D. not really A. dessert B. drawback C. science D. European A. Rugby B. greedy C. bee D. nobody A. expectation B. helmet C. substitute D. rescue A. upper B. although C. chimney D. keep cool A. carry on B. damage C. hopeful D. parden A. rights B. sprout C. ventilate D. on one's own