What are the keywords in the following sentence? Two people and their luggage traveling and snoozing on the train.
luggage, train, travel

What are the keywords in the following sentence? An empty classroom with lots of desks and two chalkboards.
classroom, desk, lot

What are the keywords in the following sentence? astronaut works outside the space station .
astronaut, station, work

What are the keywords in the following sentence? politician lays a wreath at the annual commemoration of ceremony
ceremony, lay, politician