III.

    1)dictionary

     2)watching

     3)could go

     4)do you

     5)can live

      6)so

IV.

   1.have already seen

    2.did

    3.knew

    4.bought

V.

 1.More than a century and a half

 2.As an official second language

 3.Most of children learn English at school

 4.Yes, they are

 5.Because it necessary for their jobs

VI.

  1.A new style of jeans have just been introduced in USA

  2.She asked me if I liked playing table tennis

  3.Mrs.Lan said that she would go to Hue tomorrow

  4.She has learnt English since she was 3 years old.

=>
III/
1. dictionary
2. watching
3. could go
4. do you
5. can live
6. so

IV/
1. have already seen
2. was doing
3. knew
4. bought

V/
1. For more than a century and a half.
2. In Viet Nam we use English as an official second language.
3. At school.
4. Yes, they do.
5. Because they find English necessary for their jobs.

VI/
1. A new style of jeans has just been introduced in the USA.
2. She asked me if I liked playing table tennis.
3. Mrs.Lan said that she would go to Hue the following day.
4. She has learned English since she was three years old.

VII/
1. I have not seen Mai since we left school.
2. A small banyan tree has just been planted at the entrance to the village.