1/ Did you often go to the beach when you lived in Nha Trang?
-> Did you use.................................
2/ It isn't necessary for you to go to school so early
-> You don't ..................................
3/ It's very dangerous to put a knife into an electrical socket
-> Putting............................
4/ Lan learns English quickly
-> Lan is...........................
5/ Your dress isn't the same as mine
-> My dress is.............................
6/ The cell phone isn't small. You can't put it in your pocket
-> The cell phone .............................
7/ Peter isn't rich. He can't buy a house
-> Peter.............................