A. cave B. graph C. bactericidal D. these A. northern B. sanitation C. mainly D. fertile A. leakage B. speech C. ecosystem D. fountain A. dial B. scare C. black D. virtual A. moot B. not any longer C. flower D. keep clear of A. canvas B. sewage C. Finland D. supper A. dirt B. ability C. contamination D. carton A. sun cap B. crash C. negligible D. as usual A. run-down B. like C. go climbing D. have a cold A. odds B. unforgettable C. up D. tornado