1. My sister, ________ (which/who) lives in Canada, is a dancer.
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2. Look! There’s the house ________(where/that) I used to live.
3. He went to a disco, ________ (where/which) always gave him a headache.
4. He’s a writer ________ (whose/which) books have been translated into one hundred languages.
5. This city, ________ (which/where) is very big, is also very friendly.