题目内容：

    Today Jenny and I did a special experiment. Jenny filled a jar with water and then put a cardboard on the top of the jar. Jenny put her hand on the cardboard and turned the jar u1.down quickly. I thought the water would p2.out. But to my surprise, when Jenny 3.(take) off her hand, the cardboard held the water. Jenny explained that the f4.of the air was strong enough to hold the water. From the experiment I know science is very fantastic. Scientific 5.(discovery) are amazing, too.