What are the keywords in the following sentence? Several sheep grazing over a large, green hillside.
graze, hillside, sheep

What are the keywords in the following sentence? a heavy bomber aircraft departs for a training mission over tourist attraction and training
aircraft, depart, mission

What are the keywords in the following sentence? Above a grassy area lies a wide, darkening sky with heavy clouds and one lone airplane.
airplane, area, cloud, sky

What are the keywords in the following sentence? The large meal has rice, noodles, vegetables, and meat.
meal, meat, rice, vegetable