What are the keywords in the following sentence? Fighter jet parked on grass among many planes.
grass, jet, park

What are the keywords in the following sentence? red squirrel feeding on seeds and nuts while perched on the top of a decaying tree stump
decay, nut, seed, squirrel, stump

What are the keywords in the following sentence? soldier stands guard at a checkpoint outside the southern city
checkpoint, guard, soldier

What are the keywords in the following sentence? mother lying on a sofa holding a baby in the living room
hold, lie, mother, room, sofa