Un is 'a,' masculine. Una is 'a,' feminine. Unos means 'some' or 'a few, ' masculine. Unas means 'some' or 'a few, ' feminine. That is just the answer. Enjoy
¿Puedo patadas con una tarjeta de crédito?
For #3 you could put La gente en el centro comercial nos entiende. (The people at the mall understand us.)
I don't know about #4 sorry.
But hopefully this helps
1.Tienes
2.tengo
3.Tienen
4.Tenemos
5.tienen
6.tienen
7.tiene
8.tienen
9.tiene
10.tengo
