1 . The Space Shuttle Columbia broke into pieces over Texas as it returned to Earth on 1 February 2003, ________(kill)all seven astronauts aboard.（所给词的适当形式填空）

2 . In the chaos and confusion after the Japanese planes attacked, the US Navy sent a message to his family that Louis _________ (kill) in the attack already. (所给词的适当形式填空)

3 . A heavy rainstorm triggered deadly floods in Western Europe, ________(kill) at least 220 people and destroying a number of buildings. (所给词的适当形式填空)