C-23 Optional and required relative pronouns

Is the number of young people who opt for cosmetic surgery growing or shrinking?

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Who are some celebrities whose style has affected fashion or other trends?

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How have the foods that fast-food restaurants offer changed in recent years?

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What brand names that once were very popular are no longer as relevant?

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Are there any alternative therapies that you think are ineffective or even dangerous?

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Is it becoming more difficult for people who don't speak a foreign language fluently to get a job?

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