问题描述：
There were four bulls.They were good friends and often went out t__.The tiger tried to c___them.
When he came n___,the four bulls stood side by side to fight him,so he could do n___
吃掉了牛之后，one after one he caught all the bulls and a___them up.
When he came n___,the four bulls stood side by side to fight him,so he could do n___
吃掉了牛之后，one after one he caught all the bulls and a___them up.
问题解答：
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