Question

complete the sentence with the best relative pronoun.
people sometimes discard furniture
is only a little worn but otherwise could
be salvaged and reused after a good cleaning or a minor repair.
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Explanation:

The sentence has a relative clause modifying "furniture" (a thing). The relative pronoun "that" or "which" can be used, but "that" is common in defining relative clauses (and "which" would need a comma if non - defining, but here it's defining the furniture). Since "furniture" is a singular, non - human noun, "that" is appropriate.

Answer:

that