1. The student is from china. He sits next to me.

--> The student who sits next to me is from China.

2. “The Old Man and the Sea" is an interesting novel. It was written by Ernest Hemingway.

--> "The Old Man and the Sea" which was written by Ernest Hemingway is an interesting novel.

3. Mr. Smith said he was too busy to speak to me.

--> I had come to see him. Mr. Smith, who I had come to see, said he was too busy to speak to me.

4. Do you know the reason? Marta left for this reason.

--> Do you know the reason why Marta left for this.

5. Tom has three sisters. All of them are married.

--> Tom has three sisters, all of whom are married.

6.  I recently went back to Paris. It is still as beautiful as a pearl.

--> I recently went back to Paris. It is still as beautiful as a pearl.

7. I recently went back to Paris. I was born in Paris nearly 50 years ago.

--> I recently went back to Paris. I was born in Paris nearly 50 years ago.

8. The police want to know the hotel. Mr. Foster stayed two weeks ago.

--> The police want to know the hotel where Mr.Foster stayed two weeks ago.

9. I've sent him two letters. He has received neither of them.

--> I've sent him two letters, neither of which he has received.

III. Use the relative pronoun adverb to combine each pair of sentences

1. The student who sits next to me in the English class is from China.

2. " The Old Man and the Sea" which was written by Earnest Hemingway is an interesting novel.

3. Mr. Smith who I had come to see was too busy to speak to me.

4.Do you know the reason which Marta left for

5. Tom has three sisters, all of whom are married.

6. I recently went back to Paris where is still as beautiful as  pearl.

7. I recently went back to Paris where I was born nearly 50 years ago.

8. The police want to know the hotel where Mr.Foster stayed two weeks ago.

9.I've sent him two letters, neither of which he has received.

10. My uncle who you met at the bus stop this morning usually goes to work by bus.

11. He gave several reasons, only a few of which were valid.

12. Charlie Chaplin whose films amused millions of people in the world died in 1977.

13. I saw a lot of people and horses that went to the market.

14. Tom has three sisters, all of whom are married.

15. This house which was built in 1960 is used as a library now.

16. The children who admired the lion-tamers most of all were talking about the lion-tamers

17. The dictionary which you borrowed from the school library this morning is on the table.

18. The woman who you saw on the way home yesterday is the librarian.

19. Do you want to meet the man who is living next door to me.

20. I saw several houses, most of which were quite good.