The sixteenth day is my birthday.

He is acting like catching a thief and tying him up by pointing out others' mistakes without admitting his own failures.

I will make homemade tortelloni tonight.

The Chontaduro tree is reputed to have delicious fruit.

He is studying the shape of a tetrahemihexahedron.

My younger sister is in her early teens and goes to junior high school.

Fluoromethane plays an important role in chemical reactions.

Chloromethane is often used in organic chemistry experiments.

Difluoromethane is widely used as a refrigerant.

Cyclopentane is a compound often used in organic chemistry.