从方框中选择合适的单词补全短文。
belief energy northern completely
Nature is very important to us. Last month, our science teacher took us to visit a nature park in the 1. part of our city. We saw many kinds of animals and plants there. We also learned that it was important for us to protect all living things in nature. It is important to protect the environment, and we must take action right now. We should try our best to save natural resources and 2. in daily life. It is my 3. that everyone can do something meaningful. We should learn proper ways to study and understand nature better. Everyone should do something good for our environment. The trip was 4. wonderful and fun. We hope our world will become better and better.

1. northern
2. energy
3. belief
4. completely