Why the dinosaurs died out is not known.
it is not known
the reason is not known
that is not known
No improvement
Additional Questions
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His father won t be able to leave for Varnasi until they have arrived. |
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I will not go to school, if it shall rain tomorrow. |
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I would have waited for you at the station if I knew that you would come. |
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All, but her, had made an attempt. |
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When the examinations were over Anil and me went to our native town. |
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Our office clock is not so correct as it should be it is usually five minutes fast. |
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The dissidents hold a great problem in every political party. |
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The cloud of misfortunes appears to have blown out. |
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In India today many of our intellectuals still talk in terms of the French Revolution and the Rights of Man, not appreciating that much has happened since then. |
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My friend was in hospital for a week after an accident. |
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