Here are some concepts: fill, train, travel

What is a sentence about these concepts?

Sentence is below.
A train filled with passengers traveling down railroad tracks.

Here are some concepts: airplane, land, strip

What is a sentence about these concepts?

Sentence is below.
An airplane has landed on a strip beside a waterway.

Here are some concepts: action, athlete, republic

What is a sentence about these concepts?

Sentence is below.
olympic athlete in action for constitutional republic against uk constituent country

Here are some concepts: approach, cave, entrance

What is a sentence about these concepts?
Sentence is below.
scuba diver approaches the entrance to an underwater cave