按要求完成任务。

     Wild geese have  ①lives. They fly from one place to another. They  2  homes twice every year. In spring, they fly  ③ . In autumn, they fly  4  Why do wild geese move around so much? In winter,they cannot find  5  food in the north, so they fly south in autumn. Then in spring, it is warm in the north, so they fly  6  .