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What type of noun is conductor,orchestra,and audience? ?

Use the following noun subject in sentence, first as singular (a) and second plural (b). make sure that the given verb agrees with the subject in number. meanings of the noun are in the parentheses example; alumnus (a graduate) -donate (a). an alumnus of our school donates posters for the water conservation campaign (b). many alumni of our school donate posters for the water conservation campaign 1.vita (a brief biographical sketch or profile) --submit 2.stimulus (something that causes a reaction) {no verb} 3.radius (a ray or spoke of a 4.appendix (additional matter at the end of a book or 5.larva (a caterpillar or plsss help me

Which is correct grammar, reading profile in grade 1 or reading profile of grade1?