Помогите пожалуйста в предложения надобно воткнуть am,is or are

1. John is eleven years old.
2. Mary and Jane are a student.
3.I am a student.
4. My brothers are on holiday.
5.She is a London.
6. Your cat us lovely.
7. Tom and I is friends.
8.I am at school.
9. They are doctors.
10. My favourite colour is blue.
11. I am sleepy.
12.You is good at English.

1.is
2.are
3.am
4.are
5.is
6.is
7.are
8.am
9.are
10.is
11.am
12.are