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We found the lesson was difficult to understand．

We found the lesson _______．

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The girl got up earlier so that she might not be late again．

The girl got up earlier _______ be late again．

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Jane doesn’t know how she can improve her Chinese．

Jane doesn’t know _______ improve her Chinese．

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I find that it is difficult to speak English well．

I find _______ to speak English well．

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It seemed they were writing something for somebody．

They seemed _______ something for somebody．

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When we should hold the meeting is still to be discussed．

When _______ the meeting is still to be discussed．

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The boss made the workers work all night．

The workers were _______ all night．

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The progress which will be made soon is of great importance．

The progress _______ is of great importance．

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It happened that you had known each other before．

You happened _______ each other before．

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It is impossible that a child can lift such a heavy box．

It is impossible _______ such a heavy box．