câu IX : viết lại câu ko thay đổi nghĩa
2) " Do you need a break?"the teacher said to us.
->The teacher asked
3) Get everything ready,and you can start.
->If
4) I was a child the last time i went to a museum.
-> I haven't
5) Lan is a better student than Minh.
-> Lan studies
6) In spite of  being very busy,Mr Tan tries to take good care of his children.
->Although