yes they both should be feminine it should be
Mi abuela es argentina
6. Is "Estudiaremos" , and in the list with the questions is wrong one thing says Etudiaramos more real mind is "Estudiaremos", so you have better score, correct it there, it's my recommendation.
7. Is "Hablo".
8. is "Montas en bicicleta".
1. quiero - I want
2. correr - to run
3. comprar- to buy
4. llevar - to take
5. usar - to use
6. enseñar - to teach
7. levantar - to lift
8. caminar - to walk
9. comer - to eat
10. ser - to be
In Spanish, when you want to greet someone with respect you should address them with "Usted" because "Tu" wouldn't be good manners and improper.