1 . A farmer said the storm began early in the morning and ________ (last) one hour. (所给词的适当形式填空）

2 . Bears build up fat stores throughout the summer and fall to have energy enough_____________ （last）them through their winter sleep.

3 . Water, food and electricity were hard to get. People began to wonder how long the disaster ______ (last). （所给单词适当形式填空）