看短文填空,短文是一只乌鸦喝水A crow is very thirsty

亲,我给出这片短文的原文,你找找缺少什么单词吧：
A crow （乌鸦） is very thirsty. She sees some water in the jar. “Ah, water! I must have a drink,’’ she thinks. But the jar is too tall. She can’t get to the water.
She looks around and sees some stones. She has an idea.
The crow gets a small stone and puts it into the jar. The water rises a little. One by one she puts the stones into the jar. She puts many stones in the jar. Now the crow can get to the water. She has a nice,long drink.
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