What are the keywords in the following sentence? A train on a long track with cargo during the day.
cargo, day, track, train

What are the keywords in the following sentence? the aircraft in the sky and sun
aircraft, sky, sun

What are the keywords in the following sentence? A man is whistling a tune very loudly with a very high pitch.
pitch, tune, whistle

What are the keywords in the following sentence? A large clock tower sits over a garden.
garden, sit, tower