Combine the sentences and decide if they are compound or complex sentences. 1. The air is polluted. People often have breath problems ......................................................................................................... 2. Factories release harmful gages. Factories release harmful gases. ......................................................................................................... 3. The water in the river is polluted. Fish cannot live in it. ......................................................................................................... 4. Mary wants to help the environment. She participates in beach clean-ups. ......................................................................................................... 5. The city is experiencing an increase in pullution. The government needs to take action. ..............................................................................................................