1 . 他本来可以靠捕猎为生，但是政府再也不允许杀害野生动物了。(把句子补充完整)
He ______________ by hunting, but the government won’t allow ________   wild animals anymore.

2 . 火山岩忽明忽暗，讲述着过去火山几度喷发的故事 ，这本来可以警告这座城里的人，灾难即将到来！
Its ashy rocks,now dark,now light,told a story of past eruptions that   ________ ________ ________ the city what was to come!

4 . 我有种不安的感觉，我本可以做一些更有意义的事 。
I had the uncomfortable feeling that I ____________ ____________ ____________ something more meaningful.