Decide whether the underlined word below is a preposition, interjection or conjunction. The last customer left, so we closed the shop.

The last customer left, so (conjunction) we closed the shop.

Explanation:

A conjunction is a part of speech whose role is to merge two words/phrases/clauses/sentences. We may also call them linking words. There are three types of them: coordinating, subordinating, and correlative. Coordinating conjunctions link words, phrases, and clauses that are even in a grammatical sense. For instance: I like to eat apples and pears. Some of the coordinating conjunctions, like the one used in the given sentence, are: so, or, and, but, etc.

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