Last month, I went to see my parents in the countryside with my son Tom. Tom was interested _______ everything there. He never got _______ playing outside.

At lunch, Tom told me a dog ran after a hen in the yard. The hen had no way to go, so she flew to the _______ of the house. “How can a hen fly, Dad?” Tom asked. I thought for a while and said, “Maybe（或许） _______ love. The hen loves her life and that helps her fly!” Tom _______ to understand. Last weekend, we _______ Tom’s grandparents again. This time Tom saw the dog running after the hen again. The hen was running _______. But then she stopped and turned around. She opened her wings（翅膀） and looked at the dog. Under her wings were her _______.

“Dad, _______ didn’t the hen fly away?” Tom asked. I thought for a while and said, “Maybe because she loves her babies more than _______ in the world.” Tom thought for a long time and went to help the hen.

Different animals and pets have different colors. Have you ever wondered why they have their particular colors? Colors in them seem to be used mainly to ________ themselves.

Birds, especially seagulls (海鸥), are very ________ locusts (蝗虫), but birds cannot easily catch locusts because they change their colors together with the change of the color of crops. When crops are green, locusts look green. But when crops are ripe (成熟的), locusts take on exactly the same brown color as crops have. Some other pets with different colors from plants are ________ easily found and eaten by their enemies. So they have to hide themselves for lives during the day and ________ only at night.

If you study the animal life in any part of the world, you will find the main use of color is to keep themselves alive. Bears, wolves and other beasts move quietly through forests. They are usually invisible to eyes of hunters, because they have the color much ________ the barks (树皮) of trees.

An even stranger thing remains to be noticed. A kind of fish living in the sea can send out a kind of very black liquid when it faces danger. While the liquid is over, its enemies cannot find it, and it quickly swims away. ________, it has existed (存在) up to now though it is not powerful at all.

There are many ________ in the zoo. Let’s see the koalas first. Koalas are ________ Australia. They are quiet, ________ and cute. Children like them very much.

The giraffes come from Africa. They have ________ necks（脖子）. They like to eat leaves. We also have pandas. They are from China. They are very cute and friendly, but they are very shy. You can also see many other animals in the zoo. Have ________ here!