I. 1. more delicious

     2. larger 

     3. cheaper

     4. more expensive

     5. more important

     6. happier

     7. stronger

     8. more comfortable 

     9. better

     10. worse

 II. 1. longer

     2. older

     3. bigger

     4. higher

     5. more dificult

     6. faster

     7. colder

     8. more intelligent

III. 1. She is eleven years old.

     2. She is a pupil.

     3. Yes, she does.

     4. She goes to school at half past six.

     5. No, she doesn't.

     6. Yes, it do.

     7. Classes end at half past eleven.

 IV. 1. Lan is taller than Hoa.

      2. This book is thicker than that book.

      3. The chair is shorter than the table.

      4. These books are bigger than those books.

      5. Miss Trang is younger than her sister.

      6. These buildings are higher than those buildings.

      7. The boys are stronger than the girls.

      8. I am older than my brother.

 V. 9. How does Nam go to the office by bike?

         -> Nam goes to the office by bike.

     10. How do Nga and Lan go to school by school bus?

          -> Nga and Lan go to school by school bus.

     11. Does your father travel to Ha Noi by plane?

         -> My father travels to Ha Noi by plane.

     12. How do the children go to the zoo by bus?

          -> The children go to the zoo by bus.

     13. How do you and your friends go to the stadium on foot?

          -> I and my friends go to the stadium on foot.

     14. How does Mrs. Lien go to the market by motorbike?

          -> Mrs. Lien goes to the market by motorbike.

VII. 1. helps

       2. starts / lasts

       3. doing

       4. will be

       5. go      ( vì có every afternoon)

       6. is having      ( vì có now)

       7. won't come       ( vì có tomorrow night) 

       8. are talking        (  vì có at the moment)

 VIII. 1. C     

        2. B

       3.  A

       4.  A

       5. D

       6. D

mik cảm ơn bnj nhiều nh! k chỉ giả ra mà bạn còn viết rất chi tiết và đầy đủ( mik cho bạn rùi nha!!!)