12. On account of finding the front door open, I became suspicious.
5. Having travelled a lot, he knows a lot about the countries.
6. (Bạn xem lại xem có sai đề không nhé!)
7. The boy who was crossing the road was knocked over.
10. The old man who was walking along the street was talking to himself.
11. I bought a new screwdriver to repair my bike.
14. Mary repaired her bike to ride to school.
15. Being anxious to please him, I bought him a nice present.
16. The girl standing near the door is the manager of this shop (Rút gọn của mệnh đề quan hệ)
17.Being very hungry, I ate 4 hamburgers my mother made.
$Answered$ $by$ $Mai$ $Chi$$.$