помогите пожалуйста)))

№1
1.is
2.is
3.are
4.are
5.it
№2
1.I'm not a student
2.the student isn't from Britain
3.I haven't got a plane
4.the planes aren't big
5.they aren't in the plane
№3
1.his sister is nine
2.they are at home
3.I'm five