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Complete the text with the Present passive or Past passive from of the verbs in brackets:
Early tennis balls(1)............(make) in Scotland from sheep stomachs. These tennis balls(2).............usually(3)............(stuff) with wool from the animal. In the 8th century, strips of wool(4)...............(wrap) tightly around into a little ball. Then string(5) .................(tie) around the ball and the whole ball(6)...........(cover) with a white cloth. Modern tennis balls(7)...............(make) from rubber. They (8)................then(9)...............(cover) with a solft material called felt.