Grammar in use. Practice. Морозова А.Л - 128 стр.

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years many new methods of building have been discovered. 9. People of

long ago made their homes in trees, using the leaves for keeping off rain and

sun. 10. The builders began constructing a new hospital in our street. 11.

They use pillars partly for supporting roofs and partly for decorating. 12.

After Newton' s discovering the law of universal gravitation, many people

became interested in mathematics.