A. zoo B. investigation C. total D. children A. elephant B. plain clothes C. specimen D. in ruins A. central B. ozone layer C. hers D. they're A. monkey B. beard C. billy-goat D. properly A. adaptation B. spread C. category D. tiger A. drink water B. politely C. aquarium D. short A. trapped B. minstrel C. they D. fit in A. subjective B. therefore C. twenty-one D. lion A. predecessor B. big C. to go D. Tian'anmen Square A. ingenuity B. small C. skateboard D. be caught in