What are the keywords in the following sentence? the town square christmas tree is lighted every evening at dusk
dusk, light, tree

What are the keywords in the following sentence? Small tourist train on roadway at crossing on sunny day.
cross, day, train

What are the keywords in the following sentence? student asks a question during the discussion .
ask, discussion, question

What are the keywords in the following sentence? students work at a row of computers in the library
computer, library, work