第七部分 根据要求，完成句子（共6小题，每小题1分，满分6分）
1. During World War II, when London was bombed, many underground stations functioned as bomb shelters.（填入一词，完成下面句子，并保持两个句子意思一致）
Many underground stations were as bomb shelters during World War II, when London was bombed.
2. A hard life and a weak constitution shortened Robert Burn’s life. （填入一词，完成下面句子，并保持两个句子意思一致）
Robert Burns didn’t live owing to a hard life and a weak constitution.
3. When drivers do not pay attention to surrounding traffic, they are not prepared when another driver does something wrong, like changing lanes without signaling or giving wrong signals.（填入一词，完成对上面这段话的总结）
One of the major of road accidents is given in the above sentences.
