volunteer, (n.): a person who offers help without being paid, disaster, (n.): a very bad event that causes great damage or suffering, donation, (n.): something given to help a person or cause, expert, (n.): a person with special knowledge or skill, trailer, (n.): a vehicle pulled by another vehicle, proof, (n.): evidence that something is true, fuel, (n.): a substance that produces heat or energy, declare, (v.): to say something officially

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