Use nouns in the possessive case instead of the prepositional phrases:
4.The name of their son
5. The profession of her husband
6. The family of my uncle
7. The friends of our father
8. The room of their children
9. The grandfather of my sister-in-law
10. The name of my cat

4. Their son's name

5. Her husband's profession

6. My uncle's family

7. Our father's friends

8. Their children's room

9. My sister-in-law's grandfather

10. My cat's name

A) 1. the volga is the longest river in the european part of russia. 2. i'd like to go on an excursion to the crimea. 3. there is a stadium not far from our house. the stadium is the largest in our town. 4. my brother is a pupil of the 8th form and he wants to become an engineer. 5. chemistry is his favourite subject at school. 6. children like ice-cream. 7. can you tell me the way to the theatre? 8. here is the book you need. 9. the walls of our classroom are yellow. 10. butter and cheese are made of milk. 11. which fruit do you like: apples or oranges? 12. i go to bed at 12 o'clock at night. 13. when will you finish school? 14. i get up at 7 o'clock in the morning. 6) 1. england has to import raw materials, such as timber, petroleum, wool and others. 2. many ships with grain, oil, cotton and other goods come to london along  the river thames. 3. i usually drink tea with sugar. 4. will you have a cup of tea? 5. pass me  the sugar, please. 6. the tea is very hot, i'll put milk in it. don't pour milk into my cup, please. i don't like tea with  milk. 7. peace is life, war is suffering and death. 8. what a beautiful rose! what beautiful flowers! 9. good luck! 10. we shall go to  the theatre next week. 11. we shall see a new play at  the belarusian drama theatre. 12. let's go to  the cinema. 13. they say a new detective film is on.