A.Change into passive voice:
1.      The teacher always welcomes new students.
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2.      Thomas Edison invented the phonograph in 1877.
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3.      The police found two children  in the forest.
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4.      They will send your order as soon as possible.
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5.      The scientists are studying the problem carefully.
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6.      Pat Murphy was riding the horse.
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7.      The police have just arrested the robbers.
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8.      They can use this room after 5p.m.
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9. They have to repair the engine of the car.
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10.. People must repair that old building.
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