4.E.

1. When did you get the idea for Harry Potter ?

2. How long did it take to write the first book ?

3. How old is Harry Potter ?

4. How many books have been sold ?

F.

1. his/yours

2. my/hers

3. our/them

4. her/ours

G.

1. Is that your parent's car ?

2. I don't like Jonathan's Lee new film.

3. The world's population is increasing.

6.H.

1. us/her

2. me/it/him

3. them/you

7.I.

1. is less optimistic than

2. harder than

3. more difficult than

4. worse than

5. better...than

6. as important as