1. A and B agreed to meet at the Manila Hotel at 7 p.m. on December 25, 2020. Is there a contract between A and B? Explain.
2. X and Y entered into a contract of sale wherein the former shall deliver to the latter ten bottles of brandy. X delivered ten bottles but two of them were filled with brandy diluted with black tea. Is X liable?
3. W died alone. Z, a third person, shouldered the funeral expenses because W had no known relatives. After W was buried, Y appeared and introduced himself as the brother of W. Can Z ask reimbursement from Y?
4. During a big storm, A saved the dog of his neighbour B, who was not at home at that time. After a week, B came home and was happy to see his dog alive and well. A asked B to reimburse him of the expenses he incurred in taking care of his dog. Identify the juridical tie, prestation, creditor and debtor.