11. Her father still manages to work fulltime. He is in his seventies.

-->Her father, ___________________________________________ 12. The scientist has won prizes for her work. Her vaccine was mass produced.

-->The scientist ________________

`color{red}{#Atr}`

`11.` Her father, who is in his seventies, still manages to work fulltime.

`-` her father `->` người `->` dùng ĐTQH "who"

`12.` The scientist whose vaccine was mass produced has won prizes for her work.

`-` whose + N

`@` Mệnh đề quan hệ:

`-` Who: thay thế cho người

`-` Whose: thay thế cho người, vật hoặc loài vật