The correct pronoun to complete the sentence, Let's give Shelly and them a surprise party when they get back from Europe.
Pronouns are the words that are used as a substitute for nouns.
Because pronouns are the words that are used as a substitute for nouns, Thus, the correct pronoun to complete the sentence is, Let's give Shelly and them a surprise party when they get back from Europe.
Hence the correct option is, Them
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