All of them are correct, but #3 is quite awkward.
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1-It was your house which was broken into.
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It wasn't some other house.
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2-It was last night when I saw him.
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I saw him last night.
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3-It was your house the window of which was broken.
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A window was broken in your house.
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4-It was to Jeff that I gave the box.
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I gave the box to Jeff.
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5-It was your house I broke the window of.
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I broke the window of your house.
8)