I. 1a 2d 3d 4b 5c
II. 1c 2b 3b 4c 5b 6c 7a ( ko chắc) 8b 9b 10c 
III. 1 listening 2.played 3.will get 4.has worked 5.would be 6.has built
IV. 1. educations->commerce 2. it's not only time consuming and costly 3. yes,they are 4. yes, they do
V.1.if my children were good at english 2.we had a car 3. why i had stayed there 4. were cleaned by nam last week 
5. tennis very well 
VI 1.at 2.on 3.at/on 4.from

P/s: có câu mk ko chắc, bn xem lại> Cảm ơn