What are the keywords in the following sentence? a polar bear searches the snow for food .
bear, food, search, snow

What are the keywords in the following sentence? a helicopter flies over sports facility .
facility, fly, helicopter

What are the keywords in the following sentence? hundreds of protesters gather during a protest against politician .
gather, politician, protest

What are the keywords in the following sentence? time lapse of low hanging clouds over mountain early in the morning
cloud, lapse, morning, mountain