Para entrar en el cine uno necesita un boleto, o una

entrada

Explanation:

Para entrar en el cine uno necesita un boleto, o una entrada.

entrada

Para entrar en el cine, uno necesita un boleto, o una entrada.

To enter the cinema, one needs a ticket, or a pass.

Explanation:

To enter the cinema, it is necessary to pay the established price at the box office. After paying, you receive a movie ticket that is necessary to present at the entrance of the cinema to be allowed to enter the room.