Decide whether each relative clause is Defining or Non-defining

Decide whether each relative clause is Defining or Non-defining.
(Xác định mệnh đề quan hệ trong các câu dưới đây là Xác định hay Không xác định.)
1. Have you ever been to Ibiza, which is a beautiful island of Spain?
Defining        Non-defining
2. Students who submit their assignments late will get a minus point.
Defining         Non-defining
3. Linh, who is my cousin, will get married next month.
Defining       Non-defining
4. I am going to stay with Melanie, who was a friend of mine at college.
Defining                 Non-defining
5. My laptop, which was a present from my parents, is very useful.
Defining              Non-defining
6.The doctor who you talked to yesterday works with my mother.
Defining              Non-defining
7. Anyone whose ticket has been lost must go to the front desk.
Defining         Non-defining
8. We had croissants and chips, which are my sister's favourite foods.
Defining            Non-defining
9. Two female suspects that were involved in the murder have been detained for questioning.
Defining                Non-defining
10. Little John, whose parents have died in the tsunami, is going to stay with a local family.
Defining                Non-defining