Combine the two sentences, using the relative pronoun in parentheses. Use commas when necessary.
1 That's my friend. My friend comes from San Antonio. (who)
I
2 I'm reading an article. The article discusses friendship. (that)
3 This article discusses the different types of friendship. This article is really interesting. (which)
4 Patrick is my friend. His parents are both professors. (whose)
5 We've become friends with the Chungs. The Chungs live across the hall from us. (who)