Combine each pair of sentences with a relative pronoun or adverb

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II. Combine each pair of sentences with a relative pronoun or
adverb. Put in the comma(s) where necessary.
1) That's the girl. Fred and Tom were talking about her.
2) It was the best movie. I’ve seen it this year.
3) Harry went to bed very early. He was tired.
4) Have you seen the book? I left the book on the table.