He choked on his food during the meal.

My daughter will graduate from kindergarten next week.

My younger sister will graduate from kindergarten tomorrow.

This curtain is made of fire-retardant material.

My daughter goes to the nursery school every day by the commuting bus.

I send my son to the nursery school every day.

Please attach this file to the email.

My grandfather has traveled the world when he was young.

Hydrogen is the most abundant element in the universe.