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Why the cockroaches are so many in my house?

I don't think my house is so dirty.

My mother has already killed many cockroaches recently,but they still appear in my house.

I think I'm very afraid of cockroaches because I have several bad memories about cockroaches.

When it comes to cockroaches, I would feel uneasy. 

I hope those disgusting insects can disappear from this world.

I'm always thinking why the cockroaches can exist in the world for thousands of years?