The 20th century began as a period of optimism in the Western world. What ended this optimism?

we need more information in order to answer.

what you where bleeping things out

the answer is:

when will (v) the books (n) be (v) due?

nouns refer to people (other than pronouns), places and things, whereas verbs describe actions and are usually part of the predicate of a sentence. finally, pronouns can work as nouns and identify the participants in speech.

in the example sentence, "will" is a verb part or auxiliary verb, "be" is an infinitive verb and "books" is a plural noun.

plagiarism is the act of taking one else's work and passing it off as one's own.

consequences of plagiarism include failure on the plagiarized assignment, grade reduction on given assignment, course failure, in-school suspension, and a possible chance of dismissal.