Direct Object Pronouns Practice

Tengo un libro de biología, pero no lo veo. What's the direct object pronoun and what word does it refer to?

• libro = DOP, refers to tengo
• lo = DOP, refers to libro
• lo = DOP, refers to tengo
• la = DOP, refers to biología

Esta hoja de papel es muy importante.  Tengo que ponerla en mi mochila.
What's the direct object pronoun and what word does it refer to?

• mochila = DOP, refers to papel
• la (end of poner) = DOP, refers to hoja
• la (end of poner) = DOP, refers to papel
• papel = DOP. refers to hoja

Necesito la cena.  Voy a la casa para comerla.
What's the direct object pronoun and what word does it refer to?

• la in front of cena = DOP; refers to necesito
• la (in front of casa) = DOP, refers to cena
• la (end of comer) = DOP, refers to cena
• la (end of comer) = DOP, refers to casa

Tengo muchos libros de la biblioteca.  Los voy a leer hoy.
What's the direct object pronoun and what word does it refer to?

• Los in front of voy = DOP; refers to libros
• los in front of voy = DOP; refers to biblioteca
• la in front of biblioteca = DOP; refers to tengo
• la in front of biblioeca = DOP; refers to biblioteca

Necesito estudiar y tengo mucha tarea.  Voy a hacerla ahora. 
What's the direct object pronoun and what word does it refer to?

• la (end of hacer) = DOP; refers to  tarea
• la (end of hacer) = DOP; refers to necesito
• tarea = DOP; refers to necesito
• voy = DOP; refers to estudiar

En mi casa tengo una bicicleta pero nunca la uso porque soy perezosa.
What's the direct object pronoun and what word does it refer to?

• la (in front of uso) = DOP; refers to tengo
• la (in front of uso) = DOP; refers to bicicleta
• mi = DOP; refers to tengo
• soy = DOP; refers to tengo

Te ayudo. 
In this sentence, who is the subject and who is the direct object?  What does it mean?

• Yo = subject, te = direct object; I help you.
• te = subject, yo = direct object; you help me.
• Yo = subject; tu = direct object; You help me.
• Te = subject; yo = direct object; I help you

Nos hablan.
In this sentence, who is the subject and who is the direct object?  What does it mean?

• nos = subject, ellos = direct object; They talk to us.
• ellos = subject, nos = direct object; They talk to us.
• nos = subject; ellos= direct object; We talk to them.
• ellos = subject; nos = direct object; We talk to them. 

Me ve en la tele.
In this sentence, who is the subject and who is the direct object?  What does it mean?

• él = subject, me = direct object; He sees me.
• Me = subject, él = direct object; He sees me.
• me = subject; él = direct object; I see him. 
• él = subject; me = direct object; I see him. 

Los veo.
In this sentence, who is the subject and who is the direct object?  What does it mean?

• yo = subject, los = direct object; They see me.
• los = subject, yo = direct object; They see me. 
• los = subject; yo = direct object; I see him. 
• yo = subject, los = direct object; I see them.