He had no choice but to obey his boss's orders.

He had no choice but to follow his boss's orders.

This fixture is indispensable to my daily life.

I will turn twenty years old next year.

Our project is scheduled to be completed on the twentieth day of the month.

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.

He is learning the basics of mathematics.