ПОМОГИТЕ по британскому,пжалста :с1. Заполните пропуски определенным артиклем и объясните

ПОМОГИТЕ по британскому,пжалста :с
1. Заполните пропуски определенным артиклем и растолкуйте его употребление.
1. Glasgow is situated on ___ river Clyde.
2. Nile flows across ___ north-eastern part of Africa to Mediterranean Sea.
3. Mr. Oliver was born on ___ British Isles but now lives on one of ___ islands in ___ Pacific Ocean.
4. ___Amazon is the longest river in world.
5. ___ Swiss Alps is ___ best place for mountain skiing.
6. ____North Sea and ____ Atlantic Ocean surround ____ British Isles.
7. What do you know about ____ Sahara Desert?
8. When ____ Titanic was crossing ____ Atlantic she struck an iceberg.
9.____ highest buildings are in New-York.
10._____youngest boy has just started going to school; ____ eldest boy is at college.
11. In ____ second course they study History of ____ USA.
12._____second day was like ____ first.
13. February is _____ shortest month of ____ year.
14. ____ new year begins on ____ 1
st of January.
15. ____ largest open space in _____ West End of London is Hyde Park.
16. ____ young feel more free than ____ old.
17. ____ Prime Minister is ____ most important person in Britain after ____ Queen.
18 ____ 22
nd of June is ____ longest day of ____ year.
19. The landlord found the servants among ____ poor.