A. ozone layer B. once in a while C. stress D. appoint A. photo B. motorway C. revise D. soft A. the Yangtze River B. skyscraper C. condition D. lap A. so much B. scrapbook C. library D. be at war with A. billion B. in conclusion C. space flight D. parrot A. interpreter B. at an end C. entire D. order A. workstation B. be proud of C. Well done D. baggage A. superior B. nature C. bring up D. the British Museum A. electrode B. impending C. position D. mobile phone A. in half B. output C. inventor D. nursery rhyme