What are the keywords in the following sentence? which star looks like it is giving off more light
light, look, star

What are the keywords in the following sentence? time lapse of moving clouds on a cloudy night
cloud, lapse, move, night

What are the keywords in the following sentence? A girl looking at some giraffes in an enclosure.
enclosure, giraffes, look

What are the keywords in the following sentence? a helicopter carrying the queen and the duke arrives this morning
arrive, carry, duke, helicopter, queen