He had a hard time accepting his bad grade.

He always maintains good grades.

My mother was surprised when she saw my report card.

He decided to drop out of school due to the difficulty of his studies.

She is planning a date with her current boyfriend.

He lost everything.

My boyfriend gave me a gift.

Everyone was surprised by the news.

He is in the third year of junior high school, or in other words, he is in the 9th grade in school years.

Epidemiology is the science that studies the occurrence and spread of diseases.