Помогите решить, пожалуйста..

Задание 4.  Вставьте
необходимую форму глагола to be:  am\am not,  is\isn’t, are\aren’t.

1.   
I
am… from Russia.

2.     
Debbie
and Mark  … British. They … German.

3.     
My
friend is… interested in computers.

4.     
His
parents … around 40.

5.   
Ann
… at home. Her children … at school.

6.   
How
old … you? I … 18.

7.   
London … situated on the River Evans. It …
situated on the River Thames.

8.   
Our
students … from different places.

9.   
I
… keen on sports. But I … rather good at basketball.

10.   
Her
name … Jane. It … Helen.

11.   
I
… married yet. I … single.