Exercícios com "Less" e "Fewer" em inglês

Assinale a alternativa correta usando "Less" ou "Fewer" em inglês.
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He has _______ friends now and I really worry about that.
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This book is _______ expensive than that one.
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There is _______ traffic after 10am than at 7am.
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Radio disc jockeys play _________ rock & roll songs than they used to.
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There were _______ students absent from class today.
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You'll need ______ paper if you type your report.
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Since she studied for her spelling test this week, she made ______ mistakes.
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This bedroom has ______ space than we need.
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I have ______ ideas than everyone else.
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You should spend ______ of your time complaining.
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