open the brackets use the participial with constructions with when, while, as if, as though, if, till, unless

1. when he was lying he spoke more quickly than when he was telling the truth. 2. she stood in front of the mirror as if she were speaking to herself. 3. she screamed as though she had been badly hurt. 4. he is a quiet man. he never hurries unless he is pressed for time. 5. while i was waiting for you, i was looking through newspapers and magazines. 6. when he was asked about it, he could say nothing. 7. when the article is translated, it will be typed. 8. while i was crossing the street yesterday, i saw an accident. 9. a promise accounts so little till it is kept. 10. when he was a student he used to study at the library. 11. he was hesitating whether to take the step, which if it was mistaken, could put him to trouble.

Saint Petersburg it one of one most beautiful cities of Russia.There is the river Neva in Saint Petersburg.There are white nights in Saint Petersburg.Saint Petersburg is a remarkable city.Saint Petersburg it is a very beautiful city. This city is an important economic, scientific and cultural center of Russia, large transport knot. Река that flows in city it is Neva. Through water objects very much bridges are laid. A city is located on the north-west of Russian Federation. Also in city many parks and entertaining centers.

Britain which is formally known as the United Kingdom of Great Britain and Northern Ireland is the political unity of England, Scotland, Wales and Northern Ireland. 
It is located on the British Isles
Its total area is about 244 thousand square kilometres. 
The coasts of the UK are washed by seas of 2 oceans:  the Arctic and the Atlantic.
The scenery is the coastline is rather picturesque.
The capital of the UK is London.
The official language is English.
The national symbols of the UK are the Red rose and the Lion, the flag 'Union Jack', and the anthem 'God Save the Queen'.
Its form of government is a constitutional monarchy.
Officially the supreme legislative authority is the Queen in Parliament
and the two Houses of Parliament .and the elected House of Commons. 
But The Queen officially opens each Parliamentary session.
The  three major parties are the conservative party, the new labour party, and the democratic liberal party.
The largest cities are Birmingham, Glasgow, Liverpool, Manchester, Edinburgh, Belfast and Cardiff.
The chief river is the Thames River 
Britain's major industries include  iron and steel engineering, shipbuilding, electronics.