1. Yo estoy
2. Pablo pide
3. Nosotros ponemos
4. Andres y Ana van a ir
5. Tu vendrás
6. Vosotros sábenos
7. Lilia duerme
8. Ulises prefiere
9. Tu quieres
10. Tu y yo damos
The answer is el. I hope this helps
The letter <u><em>s</em></u>, when you are reciting the alphabet or spelling out loud, is spoken as <u><em>ese</em></u> in Spanish.
Good luck!