I am majoring in immunology at university.

He underwent a cerebrospinal fluid test.

The cane toad is causing a big problem in Australia.

The smoker was smoking a cigarette outside the restaurant.

He taught me Japanese.

There is a disaster drill today.

I heard the croaking of the rain frog and felt the arrival of spring.

He was exempted from military service for health reasons.

He changed his clothes immediately after exercising at the gym.

Uriel plays an important role in Jewish tradition.