| 11. | Trenches are located at intervals across a site leaving the rest untouched.
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| 12. | Wires strung at intervals across the fields deterred the birds of prey.
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| 13. | He plays it at intervals, and Pierson listens intently for the reply.
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| 14. | Leaves are arranged in whorls of four at intervals on the stem.
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| 15. | His progress is monitored by divers stationed at intervals on the way down.
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| 16. | This is an infrequent process and occurs at intervals of years.
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| 17. | Teams started at intervals and shared the pace until the end.
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| 18. | Smaller outbursts continued at intervals until 1921, when the volcano became quiet again.
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| 19. | They stopped at intervals and threw provisions into the crowd in random fashion.
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| 20. | The latter are found at intervals along the route outlined above.
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