The outside world is full of secrets (秘密). And they are so interesting that lots of people are busy ________ them. All around us are birds, animals, trees and flowers. The facts about how they fly or ________ are as interesting as anything could be.

Do you know that one of the presidents of the USA spent hours and hours studying ________? A businessman who ________ near New York City became so interested in insects (昆虫) that he began to collect them. He now has over one thousand ________ kinds of insects carefully kept in glass boxes.

Come with me and I will help you find some of the secrets. Hush! Let’s go ________ through the woods and fields. Here we will find how a ________ tells other rabbits that there is danger coming. We will follow a mother bear and her young ones as they look for ________ and get ready for winter sleep. We will watch bees dancing in air to let other bees know where they can find food. I will show you many other ________. But the best thing that I can teach you is to keep your eyes and ________ open when you go out. Nature tells secrets only when you look and listen carefully.

It was an old winter day, Bob and two of his friends went into the mountains. They first put up their tents under the trees and then rode _______ to a forest to see how the trees were growing.

In the afternoon when they were about ten kilometers away from their camp, it started to _______. Soon they could hardly see his hands before their faces. They could not find the _______. Bob knew there were two roads. One road went to the camp, and the other went to his house. _______ everything was the same white as snow. _______ could he take his friends back to the camp?

Bob had an idea. The horses! Bob thought, “Let the horses take _______ back! But what would happen if the horses took the road _______ his house? That would be a trip of thirty-five kilometers in such cold weather! We’d better _______ our tents.”

During the summer vacation, I volunteered at an animal hospital. So I saw a lot of _______. Minnie was the funniest dog. She looked _______ a sausage（香肠）with thin curly hair, and her eyes always seemed _______, and her tail looked like a rat’s tail.

She was put here _______ the owner didn’t want her anymore. I thought Minnie had a sweet personality（性格）. “No one should judge（判断）her by her looks,” I thought.

Finally, I advertised（打广告）Minnie in the newspaper “Funny-looking dog, sweet personality, needs a loving family”.

A few days later, a young man _______ me. I told him that Minnie was strange-looking. The man on the phone told me that his father’s _______ dog had just died. A few minutes later, an old car _______ in front of the animal hospital. Two kids ran to the hospital. I hurried behind _______. They brought the dog to the grandfather, who was waiting in the car. Later in the car, the grandfather held Minnie in his arms.” She’s _______!” the old man said.

I was happy that Minnie had found a good __________. When I looked at the grandfather’s eyes, I found that he was a blind man.