10.⇒They gave me four very bad tyres, one of wich burst before I had driven four miles.

11.⇒He introduced me to his students, most of whom were from abroad.

12.⇒Jim passed the exam that surprised everybody.

13.⇒The man who I respect his opinion met is my father.

14.⇒The man who I respect most is father

15.⇒She couldn't come to the party, which is a pity.

16.⇒We enjoyed the city which has been renewed a lot of other was.

17.⇒The reason which you gave yesterday is not valid.

18.⇒We first met in 1945 when the revolution took place.

19.⇒That is the restaurant where I will meet you

20.⇒May is the month which is usually the hottest.

`10. `They gave me four very bad tyres. One of which burst before I had driven four miles.

`->`They give me four very bad tyres, one of which burst before I had driven 4 miles.

`11. `He introduced me to his students. Most of them were from abroad.

`->` He introduced me to his student, most of whom were from abroad

`12.` Jim passed the exam. This surprised everybody.

`->` Jim passed the exam that surprised everybody.

`13.` The man is my father. I respect this man most.

`->` The man who I respect his opinion met is my father.

`14. `The man is father. I respect his opinions most.

`->` The man who I respect most is father.

`15.` She couldn’t come to the party. This is a pity.

`->` She couldn't come to the party, which is a pity.

`16.` We enjoyed the city. We spent our vacation in this city.

`->` We enjoyed the city which has been renewed a lot of other was.

`17. `The reason is not valid. You gave it yesterday.

`->` The reason which you gave yesterday is not valid.

`18. `We first met in 1945. The revolution took place then.

`->` We first met in 1945 when the revolution took place.

`19. `That is the restaurant. I’ll meet you there. 

`->` That is the restaurant where I will meet you.

`20.` May is the month. The weather is usually the hottest then.

`->` May is the month which is usually the hottest.