the appropriate defintite article for mochilas is las
las mochilas
Conversations Choose the correct adverbs to complete the conversations. These are the pills that you should take. Remember, there are four pills a day; you should take them ... "Excuse me, doctor, can you talk more? I just listen to this headache." Do you get sick? "I get sick once a year." What did the doctor tell you? "I have to swim for an hour, three times a week because I feel bone pain, swimming is very good for circulation and does not hurt the bones.
enrique y yo estamos en el salon de clases
You CAN put
1: Para mi quinceañera yo ago una fiesta muy grade solo para mi.
Translation: For my fifteenth birthday, I have a huge party to celebrate me.
2: Cuando yo cumplo los quince años, mis padres hacen una fiesta de quinceañera y invitamos a todos.
Translation: When I turn fifteen, my parents have a huge party and invite everyone.
3: Para mi quinceañera muchas personas me dan regalos muy bonitos.
Translation: For my fifteenth birthday, my friends and Family give me really nice gifts.
Hope this helps :D