We conducted an investigation on that issue.

We joined the school's cheerleading squad.

There is a large fire wall in front of the fire department.

This math problem can be solved with addition only.

My younger brother is good at addition in arithmetic.

His novel is rich in detailed descriptions, attracting readers.

My area is very quiet and rich in nature.

He has extensive business experience in Europe and America.

Jun always understood the principles his actions should conform to.

She passed the pre-2nd grade.