| 31. | We had a very difficult time keeping up with him.
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| 32. | "I'm having a hard time keeping up with it ."
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| 33. | Suddenly, Rosie magazine was having a hard time keeping up with a changing Rosie.
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| 34. | Stores have had a hard time keeping up with demand.
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| 35. | We have a hard enough time keeping any horses healthy, let alone our stars.
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| 36. | I have a hard time keeping up with Quack Guru.
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| 37. | In electromechanical clocks the electricity serves no time keeping function.
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| 38. | Even so dissipated a barhopper as Morrison would have a hard time keeping up.
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| 39. | It was a hard time keeping my footing out there.
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| 40. | Now the scene has changed, and police are having a hard time keeping up.
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