Use the correct form of the Present Indefinite Tense
1. Smoke (to harm) health because of its effect on the nose, throat, and lungs. Smoke also (to make) cities (to look) dark and (to cut) out much sunlight. 2. In spite of all improvements in fighting forest fires, millions of dollars of damage (to do) every year. 3. When something (to go wrong) – a fire, medical emergency, water accident or any other threat to safety – Fire Department is there. 4. Often the fire chief (to keep in contact) with his men by two way radios. He also (to keep in touch) with fire department headquarters