13. Its ........... to complain; you wont get your money back. USE 14. During his.. ..........the family used to live in the country side. CHILD 15. He is such (a/an )............person that no one likes him. HELP

13. Its ......`text(useless)`..... to complain; you wont get your money back. 

- Used to + V

14. During his.. ..`text(childhood)`........the family used to live in the country side. 

→ Tính từ sở hữu + N

15. He is such (a/an )....`text(an helpful)`.......person that no one likes him. 

13. Its useless  to complain; you wont get your money back. USE
14. During his.. childhood the family used to live in the country side. CHILD
15. He is such (a/an )  an    unhelpful person that no one likes him. HELP