Answer:

1. Manilos class adviser gave him an envelope for his parents.

2. Manilo immediately went home and handed the given envelope to his mother.

3. Why did Mother Susan feel happy that day is that because his son, Manilo, got a scholarship in the most prestigious university in the country. His mother felt really joy as she read the letter. She might realize that all the hardwork shes done, her son Manilo exchanged it with an excellent work. And i think all mothers would be really happy if their child got a scholarship and thinking that their future would be secured.