1. If the temperature (fall) below 32 degrees, water (freeze) .
2. Water (boil) when it (be) heated to a temperature of 212 degrees.
3. If you (think) there is a gas leak, (leave) the area immediately.
4. (call) the fire department if you (smell) smoke.
5. Prices (go) up if the demand for a product (increase) .
6. If you (have) an emergency, (call) 911.
7. If you (like) bargains, (shop) after Christmas.
8. It (be) good to eat chicken soup when you (have) a cold.
9. If you (hate) hot weather, (go-negative) to San Antonio during the summer.
10. Whenever there (be) a thunderstorm, my dog (hide) under the bed.
11. (drive) carefully if there (be) ice on the road.
12. (drink-negative) if you (plan) to drive.