Find the mistakes and correct it

Ex4. Find the mistakes and correct it.
1.The board of directors are planning to implement (thi hành) new strategies next quarter.
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2. If they would have known about the changes earlier, they could have prepared better.
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3. The report was submitted after it had being reviewed by the committee.
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4. He claimed that he has completed the project by the end of last week.
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5. Each of the proposals were carefully considered before a final decision was made.
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