阅读短文，从方框中选择适当的词并用其正确的形式填空，使短文意思通顺、完整，其中有两项是多余的。
something, swim, class, careful, hour, easy ,think, minute, what, eye , try , difficult.
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It was the first biology class. The teacher wanted to give a good start to her小题1:
. she wanted to open up her students’ 小题2:
to the world of biology . She knew that teaching those young students was not 小题3:
, so she worked hard and 小题4:
to find a good way to teach them . After 小题5:
a long time , She had an idea . She decided to show the children 小题6:
interesting and give them a lesson at the same time.
She asked her students to watch 小题7:
. Then she began . She put a worn(虫) into a glass of water . the worn 小题8:
around in the water . Then she put a second worn into a glass of alcohol(酒). It was killed after a few 小题9:
. She asked the students 小题10:
they learned from it . A boy answered , “You showed us that if we drank alcohol, we wouldn’ t have worns in our stomaches. ”
时，水对桶底的压力。