What are the keywords in the following sentence? A baby zebra trying to feed off it's mother.
feed, mother, zebra

What are the keywords in the following sentence? bench in the shade of an oak tree
bench, shade, tree

What are the keywords in the following sentence? the equation of a circle is derived from its radius .
circle, derive, equation

What are the keywords in the following sentence? building will connect mass transportation system .
building, connect, system