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1, Police used tear gas to disperse the demonstrators.

2, Hydrogen is a corlorless, odorless gas.

3, These factories are releasing toxic gases into the atmosphere.

4, I'll have to gas up before we leave.

5, Oxygen, hydrogen and nitrogen are all gases.

6, She detected the odor of gas in the room.

7, My mother has a gas stove for cooking.

8, We must trace the source of these noxious gases.

9, Police used tear gas to disperse the crowds.

10, Millions died in the gas chambers in the war.

11, Nebulae contain very large amounts of ionized gas.

12, A man came to read the gas meter.

13, Gas was detected in sufficient quantity to warrant careful monitoring.

14, Gases produced in the reaction pass through this tube and can then be collected.

15, Water vapor is water in the form of a gas.

16, Through this incision,(http://sentencedict.com/gaser.html) the abdominal cavity is distended with carbon dioxide gas.

17, If you smell gas fumes or burning, take the car to your mechanic.

18, Once we got home, there was barely time to enjoy our presents. We had to go off to our grandparents' house for our annual Christmas dinner. As we drove down the highway through town, I noticed that the family was still there, standing outside the closed gas station.

19, Conversion to gas central heating will save you a lot of money.

20, Industry has been working at developing harmless substitutes for these gases.