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Переделайте следующие предложения в Passive Voice
1. They were playing tennis from four till five
2. They have carried out a number of important experiments in this Laboratory
3. Livingstone explored Central Africa in the 19th century
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1. Tennis was being played by them from four till five
2. A number of important experiments have been carried out by them in this Laboratory
3. Central Africa was explored by Livingstone in the 19th century