题目内容：

根据短文内容及括号内所给动词的提示，用正确的时态或语态补全短文，使短文完整、通顺。

A cow and a fox went out to search for food together. They1.(go) only a few miles before they saw a lion coming their way. They were both very scared. The fox thought of a way to save his own life, and went up to the lion and said in his ear, “I 2.(help) you catch the cow without the trouble of hunting (猎杀) him, if you let me go free.” The lion agreed, and the fox then led the cow to a hidden pit (深坑), which some hunters 3.(dig) as a trap (陷阱) for wild animals, and the cow fell into it. When the lion saw that the cow 4.(catch) and couldn't get away, he turned his attention to the fox. He soon killed him, and then went on to eat the cow.

Betray (背叛) a friend, and you'll often find you have ruined (毁灭) yourself.