A. article B. valid C. twenty-five D. help oneself A. used to B. fox C. tablet D. distinguish A. dreary B. cold-colored C. quack D. opportunity A. even B. winter C. homework D. have a point A. loudly B. and so on C. be made up of D. elect A. could B. believe C. taboo D. head-on A. certainty B. put away C. understand D. question A. joke around B. think twice C. knowledge D. star in A. proud B. prove C. with the help of D. daily A. environmentalist B. bathtub C. staggering D. communicate