He regretted the hours ________ he had wasted surfing the Internet and ________________ he should study at school.

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Do you know the difficulty he had ________ the work?

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Is this the watch you want to ________?

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I don't have ________ money to buy the dictionary.

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Everyone in the town knew him so we had ________ his house.

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A．no difficulty in finding

B．some difficulty in finding

C．some difficulty to find

D．no difficulty to find

He walked ________ the post office.

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Would you be ________ to step this way?

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—Have you been here long?

—________.

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It was in the lab, ________ was taken charge of by Prof. Curie, ________ they did the experiment.

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With the development of Internet, ________communication is done by regular mail.

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