III

1 don't economise

2 have learnt

3 didn't meet

4 are speaking

5 are

6 has

IV

1 In Australia and New Zealand

2 It's water sport

3 It's tennis player

4 Because Australian in New Zealand and Australia live near beach

V

1 The Nile river is the longest river in the world

2 Ba isn't as tall as Nam

3 Nam likes watching television

e động não tí là ra mà (cố lên :)) )

2. learns

3. doesn't meet

4. speak

5. are 

6. has

IV

1. They live less than 80 km from beach

2. swim, sailing and surfing

3. tennis player

4. because they live near beach

V

1. The Nile River is the longest river in the world

2. Ba is shorter than Nam

3. Nam likes watching television