1) a) Nobody knows when this fact was discovered.
b) Christopher Columbus disocvered America in 1492.
2) a) 'Battle of the Books' was written by him too.
b) Jonathan Swift wrote 'Gulliver's Travels' in the eighteenth century.
c) Who built the Tretyakov Gallery in Moscow?
3) a) A lot of strange animals were painted on the wall. We couldn't see all of them.
b) Mr Woodriff painted very good portraits when he was younger.
4) a) Mrs Pitkin didn't show me her garden when I came to visit her.
b) The small island is not shown on the map.
5) a) It was built to make the telephone and television system of the British capital better.
b) The Post Office Tower in London was built in 1964.
An old house can tell us about the past. He knows the past of other people. For example, the presence of broken toys and pieces of torn wallpaper in the monastery tells that the house was once filled with children's laughter and voices. The old kitchen and dirty pots tend to remind of the once good housewife living in the house ... And thanks to dilapidated trees or dried grass, one can understand that this was previously a place for a wonderful garden ...