A. downstream B. moot C. make up one's mind D. it A. insect B. visitor C. federal D. sterilize A. play a part B. sewage C. therein D. devise A. run-down B. fax C. sandstorm D. regulation A. tug of war B. proudly C. bactericidal D. do morning exercises A. speak English B. confirm C. upside down D. friction A. firefighter B. angrily C. methylated D. resolution A. let B. writing paper C. trivial D. disinfectant A. intermittent B. commercialization C. worn-out D. video game A. excuse B. ethanol C. distinction D. meet with