Which one can introduce a cause?

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• May I introduce（）to you？
• You can introduce the city to the visitor when first meeting visitor.。
• Chinglish is the English we use to introduce China-related affairs and Chinese culture。
• Which of the following relative words is not used to introduce a relative clause？
• The following sentence is grammatically right：“If you will meet some friends of mine in London, introduce yourself to them”。