What are the keywords in the following sentence? cargo ship in still waters in the morning under blue sky .
morning, ship, water

What are the keywords in the following sentence? christmas shoppers hurrying along the historic street at twilight
hurry, shopper, street

What are the keywords in the following sentence? mid section of a female student doing homework by laptop
homework, laptop, student

What are the keywords in the following sentence? flying to rotating blades of wind turbine .
fly, rotate, turbine