阅读短文，从方框中选择单词，根据实际情况用适当的形式，使短文意思完整、通顺。每空一词，每词只能用一次。

swim,  four,  snow,  after,  weather

    We know that there are ____ seasons（季节）in a year: spring, summer, autumn and winter. In spring, the ____ is warm. Everything grows fast. It is a good season for hiking (远足). Summer comes ____ spring. It is usually hot in summer. The children like to go ____. They are very happy in the cool water. It often rains and sometimes it rains heavily. In autumn, it is cool. The farmers are busy. It is often cold in winter. Sometimes it ____, and all the houses, trees and other things become white. The world is so beautiful in this season and people are very happy!