Read the letter. Choose the correct word.

Dear Mike,
Hi! How are you? We ... about pollution at school this week and how it destroys the natural ... of many animals. We ... protect these endangered species before they disappear altogether. For example, acid rain ... the environment for years. It starts with the smoke from power ... and the fumes from car exhausts! We ... reduce pollution. We can do little things like walking to school instead of taking the bus. The government ... about the problem and it is trying to find ways to reduce acid rain.
Write and tell me what you ... at school.
Love,
Sara