Please help me on this about "Obligation and Contract". (Arts. 1156-1304)

Thank you.

TEST I. DENTIFICATION (5 pts each) 1. An obligation which is demandable at once. 2. An obligation whose fulfilment or extinguishment depends upon a future and uncertain event. 3. The condition is capable of realization according to nature, law, public policy, or good customs. 4. The fulfillment of the condition gives rise to the obligation. 5. The fulfillment of the condition extinguishes the obligation. TEST II. TRUE OR FALSE (5 pts each) 1. Waiver for future fraud is valid. 2. If a person obliged to do something, does it in contravention of the tenor of the obligation, the same shall be executed at his cost. 3. Fortuitous events by definition are extraordinary events that are avoidable. 4. Delay begins from the time the oblige judicially or extrajudicially demands from the obligor the performance of the obligation. TEST II. PROBLEM (10 pts each) 1. X by mistake delivered to A, a sum of money (P5,000.00) which should have been delivered to B. Can X demand the return of the said amount from A ? or is A liable to return the said sum of money? 2. X migrated to the U.S.A leaving no one to manage the property. A took charge of the management of the said property and built a swimming in the said property. Can A demand for the reimbursement of the expenses paid for the swimming pool? 3. X promises to give P10,000 to Y, if the latter will graduate from college magna cumlaude. On June 30, 2022, Y graduated from college cumlaude, Can Y demand the payment of P 10,000 from X ? 4. X, a developer was contracted by H to construct a house, provided that the roof should not be extended beyond the walls. However, despite repeated warning from H,X extended the roof beyond the wall. Can H demand from X to remove the roofing TEST I. DENTIFICATION (5 pts each) 1. An obligation which is demandable at once. 2. An obligation whose fulfilment or extinguishment depends upon a future and uncertain event. 3. The condition is capable of realization according to nature, law, public policy, or good customs. 4. The fulfillment of the condition gives rise to the obligation. 5. The fulfillment of the condition extinguishes the obligation. TEST II. TRUE OR FALSE (5 pts each) 1. Waiver for future fraud is valid. 2. If a person obliged to do something, does it in contravention of the tenor of the obligation, the same shall be executed at his cost. 3. Fortuitous events by definition are extraordinary events that are avoidable. 4. Delay begins from the time the oblige judicially or extrajudicially demands from the obligor the performance of the obligation. TEST II. PROBLEM (10 pts each) 1. X by mistake delivered to A, a sum of money (P5,000.00) which should have been delivered to B. Can X demand the return of the said amount from A ? or is A liable to return the said sum of money? 2. X migrated to the U.S.A leaving no one to manage the property. A took charge of the management of the said property and built a swimming in the said property. Can A demand for the reimbursement of the expenses paid for the swimming pool? 3. X promises to give P10,000 to Y, if the latter will graduate from college magna cumlaude. On June 30, 2022, Y graduated from college cumlaude, Can Y demand the payment of P 10,000 from X ? 4. X, a developer was contracted by H to construct a house, provided that the roof should not be extended beyond the walls. However, despite repeated warning from H,X extended the roof beyond the wall. Can H demand from X to remove the roofing