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2. Secondhand smoke also damages blood vessels, interferes with circulation and increases the risk of _____________.

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3. She is deaf, but refuses to let her __________ prevent her from doing what she wants to do.

4. Research data indicates that moderate and high levels of physical activity may reduce the risk of total, ischemic, and __________ strokes.

5. After his daughter found him and called an ambulance the old man died because of a respiratory tract ________ by a nosebleed.

6. Inside this water-eroded cave is a spectacular world of various stalactites, stone pillars and rock formations created by carbonate __________.