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Nobody (is, are) allowed to leave until everyone has finished their work.

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Each of the students (have, has) completed his or her assignment.

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None of the cookies (was, were) left; all of them were eaten during the party.

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Both of the teams (is, are) confident in their abilities to win the championship.

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Neither of the options (seems, seem) suitable for our project.

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Many (has, have) tried, but few (has, have) succeeded in solving this complex puzzle.

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Most of the information provided by the witnesses (corroborates, corroborate) their alibi.

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Some of the books (has, have) lost their covers, but they are still readable.

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Nobody (wants, want) to admit that they were responsible for the office prank yesterday.

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All of the participants (is, are) required to submit their registration forms by tomorrow.