I 

1. Bạn làm đúng rồi !

2. has over 26 classrooms

3. are beautìul girls

4. more expensive than living in Ho Chi Minh City

5. seen Jane for 3 months

II

1. Mr và Mrs are Peter's parents.

2. Why don't we go to the movies tonight ?

3. What a beautiful dress !

4. Although Lan can't sing but she can play the piano very well.

5. Bạn làm đúng rồi !

I

1 If we plant more tress, the air will be fresher.

2 My school has over 26 classrooms.

3 They are beautifull girls.

4 Living in Ha Noi isn't as expensive as living in HCM city.

5 I haven't seen Jane for 5 months.

II

1 Mr and Mrs Brown are Peter's parents.

2 Why don't we go to the cinema.

3 What a beautiful dress! 

4 Although Lan can't sing, she can play the piano very well.

5 Nam is the most intelligent student in our class.