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П. Напишите вопросы к выделенным членам предложения.

1. Having been wanned to 0° ice began to melt. 2. The data so far obtained were of no interest. 3. Having been used for a long time the device partly lost its efficiency. 4. The distance travelled during the next hour changed greatly, 5. While being used the device showed poor characteristics. 6. Knowing length and time we can define velocity. 7. If cooled water becomes ice. 8. Having been well tested the machine was put into operation.