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⑴(english /it /necessary/study/is/to)every day.
It is necessary to study English every day.

⑵(better/I/to/it/think/agree)to their proposal.
I think it better to agree to their proposal.

⑶He (answer/the question/to/it/hard/found).
He found it hard to answer the question.

⑷(important/to/never/is/it/give) up.
It is important never to give up.

⑸It is (not/answer/impolite/an e-mail/to).
It is impolite not to answer an e-mail.

どうでしょう?

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