This festival is held every year.

I will teach mathematics to new students tomorrow.

I attended a math class today.

We conducted an experiment on electrolysis in chemistry class.

The chemist electrolyzed water to produce hydrogen and oxygen.

We conducted a new experiment in science class.

He is majoring in chemistry at university.

We will conduct a new chemistry experiment tomorrow.

He is an expert in chemistry.

The use of mobile phones is prohibited during class.