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I go to visit my grandparents every ________ weeks. (second)

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That is the ________ dish she has washed. (five)

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The ________ Earth Day was a success. (one)

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The event is on April ________ (ten).

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I am sorry to learn about your ________ (ill)

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It's easy _________ (solve) the problem.

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Students learn about ________ pollution better. (control)

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________, don't throw cans or paper on the ground. (two)

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________, we should remember Earth Day every year. (too)

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I am going to meet her for ________ time. (one)