BỊ ĐỘNG NÂNG CAO 1. It is your duty to obey him....... 2. You needn't have done this.. 3. Don't touch this switch..... 4. We considered that she was the best doctor that Australia has ever produced... 5. You have to see it to believe it..... 6. Don't wipe your dirty fingers on my clean table cloth.... 7. I didn't let him know what I was thinking.. 8. It's necessary to concentrate on your lessons. 9. No one can do anything unless some one gives us more in formation....... 10. Members may keep books for three weeks, after that they must return them......

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