I.

1. "I will give you a brand new car on your 21^st birthday>" Is this with a period or condition? Reason.
2. A will give B P10,000. May the court fix the duration of the period? Reason.
3. X will give Y any one of the following specific things- a horse, a cow or a pig. Before X can choose, the cow and pig were lost due to his fault. Before X delivers the horse, it was lost because of fortuitous event. Is the obligation extinguished? Reason.

II.

1. A, B and C are indebted to X in the amount of P3,000. On due date, from whom may X collect the payment?
2. "I promise to pay X the sum of P10,000 Signed by: A and B". Is this joint or solidary obligation?
3. "We promise to pay X P10,000 Signed by A and B". Is this joint or solidary obligation?
4. X, Y and Z are the solidary creditors of A in the sumof P30,000. Y made a demand on A but the latter paid the whole amount to Z. Is the obligation extinguished?
5. A , B and C are individually and collectively indebted to X in the sum of P300,000. Despite several demands, the debtors failed to pay. X sued B only for the whole amount. Is this proper?