Homophonic words are difficult, aren't they?

He is majoring in zoology at university.

We went on a trip using the highway.

They opposed the plan in concert.

He was skilled in using an ancient weapon, a chain with a weight on one or both ends.

In the next election, swing votes may determine the outcome.

Kinetics is the study of the motion of objects.

I use a set square to draw shapes.

In chemistry class, I learned about acid anhydride.

In chemistry class, I learned about acidic oxides.