四、根据语篇内容，从方框中选择正确的单词填空。部分单词在填入前需进行词形变换。
build mirror madly boring they rescue surprise amazing scary metre

Today I go to the park. I see many pigeons. I feed them some seeds. They fly 1. to get the food! It is not 2. at all. One pigeon looks at me. Maybe it knows me?
Later, I walk by the river. I see something 3. ! A beaver! It is working hard. It 4. a dam with wood. It uses its strong teeth to build it. The water is like a 5. . The beaver sees itself? That's funny! I watch quietly. I don't want it to get lost or scared.
Suddenly, I hear a sound. It's a bit 6. . I see a wolf! It is watching the beaver from several 7. away? Wow! The wolf has enough speed to run fast. It doesn't attack. Maybe the beaver is safe today. Animals need to protect 8. .
A park worker, like an engineer for nature, sees me. "Are you doing research?" he asks. I smile, "Yes!" He says they sometimes help 9. animals too. He tells me not to worry about missing animals; rangers (护林员) save them if they get lost.
What a 10. ! Nature is full of heroes.

1. madly 2. boring 3. amazing 4. is building 5. mirror 6. scary 7. metres 8. themselves 9. rescue 10. surprise