Education about sex is very important.

We are planning to go to the science museum tomorrow.

He is a renowned scientist who has made many discoveries.

There is a class observation at my son's school tomorrow.

The use of mobile phones is prohibited during class.

Please use the emergency stairs in case of a fire.

Due to the earthquake, the city declared a state of emergency.

My favorite subject is mathematics.

He was arrested for committing a crime.

He learned the old character form of 學 to study ancient documents.