What are the keywords in the following sentence? father and children visiting their mother in the hospital
father, hospital, visit

What are the keywords in the following sentence? trees bloom for spring on street
bloom, spring, tree

What are the keywords in the following sentence? a hiking trail descends nearby into a narrow canyon .
canyon, descend, trail

What are the keywords in the following sentence? A white plate holding pasta, broccoli and rice.
broccoli, pasta, plate, rice