What are the keywords in the following sentence? trams running for the first time in years
run, time, tram

What are the keywords in the following sentence? bassist performs during day of festival
bassist, festival, perform

What are the keywords in the following sentence? i took the roads less traveled by ... and that has made all the difference
road, take, travel

What are the keywords in the following sentence? chemical element is number in the periodic table

element, number, table