Переведите предложения в страдательном залоге и определите время.

1.Distance is usually measured in millimetres, centimetres, metres or kilometres. 2. Mass is measured in grams or kilograms and time is measured in seconds, minutes and hours. 3. The photoelectric effect was discovered by Heinrich Hertz in 1887. 4. Galileo lived at a time when the human spirit was waking after a thousand years of sleep. 5. Men were filled with a new life, and they made splendid progress in the arts and science. 6. The element in the air which is most important to us is oxygen.

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