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选词填空。 that foot the fall do try they slow both of  &nbs

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选词填空。
that foot the fall do try they slow both of
     Galileo, lived in the city of Pisa, where there is a leaning tower about 180     1    high. From the top      2 
 the tower Galileo dropped a light ball and a heavy ball exactly at     3    same time. They     4    fell at about the
same speed and hit ground together. He     5    it again and again. Every time he got the same result. At last, he
decided     6    he had found the truth about      7   objects. As we know now, heavy objects and light objects
fall at the same speed unless air holds     8    back. A feather falls     9    than a stone only because the air holds
the feather back more than it     10    the stone.
1.______ 2.______ 3.______ 4.______ 5.______
6.______ 7.______ 8.______ 9.______ 10.______
1. feet   2. of   3. the   4. both   5. tried
6. that   7. falling   8. them   9. more slowly   10. does