10. Because of driving too fast, he caused a serious accident.
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11. Because of the snow, the traveler lost the way in the woods.
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12. Their project hasn’t been finished because of the lack of money.
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13. He is tired because of staying up very late last night.
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14. She didn’t receive the prize because of the bad marks in Mathematics.
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15. We can solve difficult problems in a few seconds because of the invention of computers.
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giup em vs a