A. thirty B. stalactite C. police officer D. red A. pollute B. typical C. felt D. school A. civilized B. bike C. pay attention to D. good A. even B. car C. frog D. licence A. limestone B. stone C. yellow D. officially A. retell B. ensue C. bus D. instalment A. swap B. light the candles C. agency D. street A. mother tongue B. taxi C. confirm D. opaque A. stagger B. any time C. impulse D. from A. chant B. library C. confiscate D. build