1. Mrs. Hoa has taught us English since 2007.
-> Mrs. Hoa started........................................
2.Do you mind if I open the door?
-> Would....................................................
3.She is not rich, but she wants to take a trip abroad.
-> If............................................................................
4.She did not go to school yesterday because she was ill.
-> Because of...............................................................
5. I suggest collecting all waste paper in the classroom.
-> Why.........................................................?
-> I think....................................................
-> What about............................................?