根据题意及首字母提示，写出四季名称。

1. It's hot. You can wear your T-shirt. It's s____________.

2. It's windy and warm. You can wear your jacket and sweater. It's s____________.

3. It's windy and cold. You can ski on the snow. It's w____________.

4. It's windy and cool. Leaves begin to turn yellow. You can play in the wind. It's f____________.