=>
I/
1. C /eə/ còn lại /iː/
2. A /id/ còn lại /t/
3. D /e/ còn lại /eɪ/
4. C /ð/ còn lại /θ/
5. D /əʊ/ còn lại /ɒ/

II/
1. after 
2. on
3. didn't use to
4. working
5. because
6. naturally
7. don't they
8. whom
9. clanging
10. elevate

III/
1. to having -> to have
2. in two -> for two ( Họ đang quen với việc đi bộ đến trường khoảng 2 tháng rồi) ( in two months : trong 2 tháng nữa -> dùng thì tương lai)
3. can go -> could go
4. will be turned -> would be turned
5. to go -> going

IV/
1. I didn't spend as much money during the trip as you did.
2. Is this your first time visit to Kuala Lumpur?
3. I wasn't very interested in this place.
4. It is three years since we last went to Spain.