Open the brackets paying attention to the tenses you use. 1. The nurse (to return) to the operating room before the operation

 1. The nurse had returned to the operating room before the operation started. 2. He did not bandage the limb when the bleeding started again. 3. The blood had been transfused by 5 o ’clock yesterday. 4. When the assistant came to the laboratory a few glasses had exploded already. 5. The boy had fractured his leg before the help came. 6. We will have held our meeting by the end of the next week. 7. He will have incised the tissues by the time our teacher comes. 8. I will have drawn the scheme of the neuralgia cells today 5 o ’clock. 9. By two o ’clock the surgeon had performed appendectomy.