The cones of the jack pine, for example, do not readily open to release their seeds until they have been subjected to great heat.

Tom wrote a paper on that subject.

They hold the same opinion on that subject.

I think I'm going to fail a subject.

Planning experts and local officials say suburban sprawl has negative impacts on the environment, puts a heavier burden on local services, isolates people, and excludes lower income households and households with people of color from certain communities through economic means.

Don't dwell too much upon the subject.

On a first date, it's best to steer clear of touchy subjects.

Agricultural subsidies are one of the most important and controversial budget items in the European Union.

We have to submit it before the deadline.

The subway is under renovation.