英文：根据短文和首字母提示，写出短文中所缺单词的正确形式。（题目在内）

英文：根据短文和首字母提示，写出短文中所缺单词的正确形式。（题目在内）
There are b___ of stars in the sky---but you can only see about 3,000 with your o___ eyes. Get a map of the stars and begin to find your way t___ the sky. In different s___， you can see different groups of stars. The s___ of these groups never c___. It is easy to learn the name of each group. Sometimes， you may see a star move. H___， if you see it move from one group to a___， then it is not a star but a p___. You will soon begin to learn more and m___ about the stars.