Find and correct the mistakes in the following sentences. Write the correct sentences.

1. That’s the book which I read it last year.
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2. The science fiction writer which I admire the most is Terry Pratchett.
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3. Our science teacher, I liked a lot, retired last year.
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4. The litter what we in the countryside can be bad for the environment.
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5. The man who’s house was hit by a piece of space junk received ten thousand pounds.
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