How am I supposed to complete the dialogue logically to help you if there is nothing to complete, I don't wanna sound rude, I just want to help
You use preterite to describe an action that took place and was fully done, Ex. José entro a la habitación, you can see John went into the room, he completed the action. On the other hand, imperfect tense doesn't specificate if the action was completed, Ex. José entraba a la habitación, it doesn't tell us if José fully entered the room.
Explanation:
1. A ella le gusta la clase de español
2. A nosotros nos gusta la pizza
3.a ustedes les gusta los perros
4.A usted le gusta leer
5.a ti te gusta estudiar
Response:
Me encantan las sillas que ustedes venden, pero me parece que el precio esta costoso.
Best regards