说下理由句型转换：To look up the words in a dictionaryis helpful for
说下理由
句型转换：
To look up the words in a dictionaryis helpful for us.(改为同义句)
______is helpful for us ______look up the words in a dictionary.
They are too tired to exercise.(同上）
They don't exercise because they_____ _____ _____ _____.
句型转换：
To look up the words in a dictionaryis helpful for us.(改为同义句)
______is helpful for us ______look up the words in a dictionary.
They are too tired to exercise.(同上）
They don't exercise because they_____ _____ _____ _____.
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