What are the keywords in the following sentence? april is a great time of year to visit national park as plants are in full bloom .
park, time, visit, year

What are the keywords in the following sentence? a strawberry in the shape of a heart
heart, shape, strawberry

What are the keywords in the following sentence? An elephant locked in a stall reaching over the gate with its trunk.
elephant, gate, stall

What are the keywords in the following sentence? night above country highlighted in red on model in space .
country, night, red, space