Bài 3

1, who

2, which

3, who

4, who

5, which

Bài 4

1, Al Gore, who won the Nobel Prize, gave a long and boring speech.

2, Starbucks, which does business all over the world, wants to open new stores in China.

3, Social network sites which are very popular will definitely change business.

4, Scientists are working with stem cells which will revolutionize medicine.

5, Last week, Jim Taylor interviewed Sally Thomson, who is my neighbor 

6, Mr. Brown, who enjoys going to the theater, has been invited to join our club.

7,Whiting House, which was built in 1856, is an important local monument 

8, Bono, who is a famous musician, signed autographs at Tower Records yesterday 

9, John F. Kennedy, who was president of the USA, was assassinated in 1963

10, The Queen will open a new hospital which is in Jarvis street

Bài 5

1, A - who discovered penicillin 

2, B - which is

3, D - who came to America 

4, C - has

5, A - that function together 

6, D - has many canals

7, B - which are considered 

8, C - that influenced an entire generation of authors 

Bài 6

1, Defining: Peter Pan, who was my classmate, will visit my aunt this Sunday.

Non-defining: Peter Pan, who will visit my aunt this Sunday, was my classmate.

2, Defining: Kenny,  who is in my class, is a lovely boy.

Non-defining: Kenny, who is a lovely boy is in my class

3, Defining: Mary is arguing with Peggy who is the horrible person 

Non-Defining: Peggy, whom Mary is arguing with, is a horrible person.

4, Defining: I will going shopping with Anna, who is a hardworking person

Non-Defining: Anna, whom I will go shopping with, is a hardworking person 

5, Defining: Our school, which is Pig’s College, was found in 1997

Non-Defining: Pig’s College, which was found in 1997, is our school

6, Defining: Our principal, who is called Mr. Brown will come to visit us this Monday.

Non-Defining: Our principal, who will come to visit us this Monday is called Mr. Brown.

7, Defining: Jenny is going to present something about pandas which are the rare species 

Non-Defining: Pandas, which Jenny is going to present about, are the rare species 

8, Defining: Alex, who is the chief director of a company, is shopping in the market 

Non-Defining: Alex, who is shopping in the market, is the chief director of a company 

10, Defining: The World Trade Center, which is the landmark of America, has been collapsed 

Non-Defining : The World Trade Center , which has been collapsed, is the landmark of America

11, Defining: Mary is shopping in Sogo, which is the greatest shopping mall

Non-Defining: Sogo, which Mary is shopping in, is the greatest shopping mall.

12, Defining: I, who is one of the intelligent people, like playing games.

Non-Defining: I, who like playing games, is one of the intelligent people 

Bài 7

1, who -> which

2, that his experience -> whose experience 

3, True

4, what -> which

5, train, which goes -> train which goes

6, that -> which

7, which -> who

8, True

9, which -> who

10, that her photograph -> whose photograph