Fogging decreases ____. It may lead to traffic accidents. Thunder and lightning may strike ____. Snowing makes the ground ____. People may slip and fall. Hailing may break ____ and cause injury. Rainbow, fog, snow and thunder are ____. ____ helps plants grow. ____ makes animals feel warm. ____ will hurt our eyes if watch it ____ for a long period of time. ____ will cause sunburn if we are ____ to the sun for a long period of time. ____ generate electricity. The ____ of the sun causes the water on the earth's ____ to become ____. When the ____ rises to a ____, it becomes ____ and changes back into ____, forming clouds. When the ____ in clouds grow in size gradually, their ____. They fall as ____ at last. When dark clouds appear on the sky, take ____ because it may ____. Sunlight can hurt our ____. Sun's heat can harm our ____. ____ sunscreen lotion, put on a hat can ____ ourselves from being ____ by sun. Put on sunglasses, hat and sunscreen lotion are effective ____ to protect ourselves from ____ to the sun's light and heat. When it is ____, we can wear thick clothes and ____. When it is ____, we can turn on the ____. When it is ____, do not stay in ____. When it is ____, stay in a ____ . We have to protect ourselves with ____ methods. Stay ____ when hail is falling.

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