Case 1: Having failed to pay rent for three (3) months, the lessor demanded that the lessee pay the back rentals and vacate the premises. Afterwards, the lessor filed a complaint for unlawful detainer. The lessee contends that the lessor refused to accept the rents. Is the contention of the lessee a valid defense to release him from his responsibility to pay rent? What should have been the action by the lessee to release him from responsibility?

Case 2: Ara borrowed P1 million from Barry. The loan was secured by a mortgage of Ara's land in favor of Barry. Without the knowledge of Ara, Clara paid Barry the sum of P1 million for Ara's debt. Ara benefited to the amount of P1 million.

1.May Clara claim reimbursement from Ara?

2.If so, how much?

3.If Ara cannot pay, may Clara foreclose the mortgage on Ara's land?

Case 3: Andy owes Brandy P1 million. Candy, in behalf of Andy, pays Brandy P1 million against the consent of Aandy, although Candy had previously told Andy that she (Candy) did not intend to be reimbursed. Needless to say, Brandy accepted the payment by Candy in behalf of Andy.

a.Is Andy's obligation towards Brandy extinguished?

b.May Candy still recover from Andy, because of the fact that Andy did not consent to what the law deems a donation on the part of Candy in favor of Andy?

Case 4: Pedro purchased a computer from Pedra. As payment, Pedro gave Pedra a

check equal to the selling price of the computer? Was there payment made? Why?

Case 5: Mario is indebted to Maria in the amount of P100,000. Neither informing Mario nor asking his consent, Mark offered and Maria accepted to have Mark pay Mario's obligation, the latter not knowing that Mark is already insolvent. Is Mario still liable? Why?