| 11. | The animals purr a relaxing trill that the crew find soothing.
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| 12. | Females also emit a " purr " while incubating.
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| 13. | Once up to running speed, however, the motor purrs.
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| 14. | "Let's watch Dad, " she purrs.
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| 15. | Mercedes and Volvo cars purr along broad, clean avenues.
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| 16. | "Lucky for you, " she purrs.
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| 17. | Under the new hoods purr new engines _ well, almost new.
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| 18. | "You're the purr-fect apartment-mate.
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| 19. | Cat owners have long known that cats will purr while being stroked.
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| 20. | I have Colin Firth and Ralph Fiennes, " she purrs.
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