What are the keywords in the following sentence? a ghostly face appears in the darkness .
appear, darkness, face

What are the keywords in the following sentence? structure and parts were closed to all vehicular traffic on saturday .
close, part, traffic

What are the keywords in the following sentence? unidentified people walking along the flat escalator in red tunnel
escalator, tunnel, walk

What are the keywords in the following sentence? students could see how different kinds of baggage being loaded onto the aircraft on the apron .
aircraft, baggage, load