Dear X,

I'm writing to you about a bad situation, which is affecting the lake near my school. As you know, the lake near my school is very beautiful. It used to be a place for dating and art. However, it has become polluted recently. There are many causes. For instance, many people have used electricity to catch fish, which causes lot of floating fish on the water surface. Moreover, they have also thrown rubbish and waste into the lake. As a result, now the bad smell is affecting the children's health. It's really bad, right? What do you think about this polluted air? I'm looking forward to hearing from you and protecting from the local authority.

Sincerely,

Long