阅读短文,根据短文内容填空。
In spring, it is often warm. The trees and grass turn green in spring. Sometimes it’s windy, so we can fly a kite outside. In summer, it’s hot. It usually rains. The days become long and the nights become short. We can go swimming in summer. In autumn, it is cool. The leaves fall down from the trees. People like to have a picnic with the family. In winter, it’s cold. Sometimes it snows. We can ski and skate. They are very interesting. We can also play with the snow.
39. The trees turn
______ in spring.
40. In summer, it usually
______.
41. The
______ are long and the
______ are short in summer.
42. People usually have a picnic in
______.
43. We can
______ and
______ in winter.