Fill in the blanks with the given words in their proper forms（用所给单词的适当形式填空，每空格限填一词）

They thought the earth was the centre of the ______ ．(universal)

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He ________ (blame) for the accident.

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He ________ (tell) to put the books back where he takes them.

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The fish in the river are ________ (die) slowly because of the polluted water.

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The labels must be clear ________ (read) to avoid any misunderstanding.

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The date for the sports meet has to ________ (change) because of the rainy weather.

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I wonder if he ________ (come) to attend my birthday party tomorrow.

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Books must ________ (keep) in good condition when you read it.

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No pets ________ (allow) in public libraries in the U.S.A.

Fill in the blanks with the verbs in their proper forms（用所给动词的适当形式填空，词数不限）：

I shall never forget ______ (hear) you sing.