I bought it as a textbook for the academy.

I purchased this as a textbook for the academy.

I purchased this as a textbook for the academy.

I purchased this as a textbook for an academy.

This is a textbook from an academy. It is said to have many interesting topics.

I'm studying hard at the academy.

It's a textbook for the academy, and it's good.

I bought it as a textbook for the academy.

I purchased this as a textbook for the academy.

Problem solving when introducing basic concepts