1. All the students love the principal. He is very kind. (because of)

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2. I have forgotten the tickets. I’m sorry for it. (having)

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3. I saw it with my own eyes. I believed it. (if)

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4. The house at the end of the street has been sold. It has been empty for years. (which)

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5. It's a pity he doesn't take the doctor's advice. (wish)

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