đánh dấu vào các câu đúng và sửa các câu sai
1. he studied so badly that he couldn't pass the exam
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2. it is very cold . we can't bathe
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3. would you be very kind and answer this letter by return
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5. the floor wasn't strong . we couldn't dance on it
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6. there were so many exercises that I couldn't finish them in a short time
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7. he spoke so fast that we couldn't understand him
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13. I am rather old . I can't wear that kind of hat
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14. the ladder wasn't very long . It didn't reach the window
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