| 31. | Lungs are so filled with fluid to fight infection that they stiffen.
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| 32. | The cables would stiffen the mast by compressing it with tremendous force.
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| 33. | Pirro's back stiffens when she hears the charge.
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| 34. | Whenever you move down the field, the defense stiffens.
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| 35. | If necessary, add additional flour to stiffen the dough.
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| 36. | -authorities must also stiffen their guard at borders and air terminals and
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| 37. | The resistance to Kremlin rule stiffens, the guerrilla war drags on.
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| 38. | Authorities promised to stiffen security along routes in the south.
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| 39. | Some colonial sea anemones stiffen the mesoglea with sediment particles.
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| 40. | Fluids are pumped into the wings, and they expand and stiffen.
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