What part of speech does the word in capital letters play in this sentence?

silver will tarnish if it is not polished often

*interjection
*pronoun
*conjunction
*adverb

Preview the following sentence and identify the meaning of the underlined word in the sentence. the brain was riddled with holes, it looked like a sponge. a. bridled c. perforated b. pierced d. b and c select the best answer from the choices provided a b c d mark this and return