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

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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 __________.

7. He picked it up gingerly, holding it away from his body as one might _________ a suspicious package.

8. Both steps would require huge courage by the two leaders; both may well _______ .