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The world of the out-of doors is full of secrets. And 1. ________ are so interesting that quite a lot of people are busy studying them. All around us are birds, animals, trees and flowers. The facts about 2.________ they live and grow are as interesting as anything could be.
Do you know that one of the great presidents of the United States 3 ________ hours and hours studying birds? A businessman who lives near New York City became so interested in insects(昆虫) that he began to collect them. He now has more than one thousand different kinds 4. ________ kept in the glass boxes.
Come then with me, and I will help you find some of Nature's secrets. Let us go quietly through the woods and fields. Here we shall find how a rabbit tells the other rabbits that there is danger. We shall follow a mother bear and her young ones as they search for food and get ready for 5. ________ sleep. We shall watch bees 6. ________ in the air to let other bees know where they can find food. I will 7.________ you many other interesting things, but the 8. ________ thing that I can teach you is to keep your eyes and ears 9.________ when you go out of doors. Nature tells her secrets 10.________ to people who look and listen carefully.