根据短文内容选择适当的单词，并用其正确形式填空，每个词限用一次。 good,  way,  hurt,  strong,  child,  make,  each,  dangerous,  leaf,  fill Man invented a lot of sports equipment. The first thing invented was the ball. Thousands of years ago, in Egypt, the 1. _ favorite game was throwing stones.But a badly thrown stone could 2. _ a child. Looking for something less 3. _ to throw, the people in Egypt 4. _ the first balls. At first, they used tree 5. _____ to make balls. They used vines ( 藤) to keep the leaves together. Later they began to use pieces of animal skin to make balls and 6. _ them with some light things.  These balls were much 7. _ than the old one. Before long they invented a lot of ball games, and 8. _ had its own rules. They began to play these ball games according to the rules. They thought that ball playing was one of the best 9. _ to teach the young men to be brave and 10. _ .