Use a relative pronuon preceded by a preposition to combine each of the sentences below:
The teacher is Mr Tom.We studied with him last year.
--> The teacher with whom we studied last year is Mr Tom.
The problem has been discussed in class. We are interesting in it.
--> The problem in which we are interesting has been discussed in class
Many diseases are no longer dangerous. People died of them many years ago.
--> Many diseases of which people died many years ago are no longer dangerous
Do you see my pen? I have just written the lesson with it.
---> Do you see my pen with which I have just written the lesson
I like standing at the window. I can see the park from this window.
--> I like standing at the window from which I can see the park

=>
1. The teacher with whom we studied last week is Mr.Mike.
2. The problem in which we are very interested has been discussed in class.
3. Many diseases of which people died many years ago are no longer dangerous.
4. Do you see my pen with which I have just written.
5. I like standing at the window from which I can see the park.
6. We are crossing the meadow over which we flew kites in our childhood.
7. The are repairing the tubes through which water is brought into our house.
8. In the middle of the village there is a well from which the villagers take water to drink.
9. This is a race opportunity of which you should take advantage to get a better job.
10. The middle-aged man to whom my father is talking is the director.
11. The boy of whom you made fun is my cousin.
12. This matter to which you should pay attention is of great importance.
13. The woman to whom you gave place on the bus lives next door to me.

14. This snake of which you are afraid is not venomous.
15. The examination in which I was successful lasted two days.
16. These children of whom she is taking care are orphans.
17. The two young men with whom you are acquainted are not good persons.
18. This is a result of our work, with which I'm pleased.
19. There is a "No Parking" sign of which I do not take notice.
20. Mr.Brown is the man to whom I'm responsible for my work.