d) Nevertheless 6. When they are powerful, tornadoes often destroy buildings and houses. _______ they injure and kill people. a) Still b) However c) Conversely d) Moreover 7. _______ Artificial ...

Lightning is a bright flash of electricity produced by a thunderstorm. Lightning kills and injures between 75 and 100 people every year - more than hurricanes or tornadoes. The highest death toll from ...