What are the keywords in the following sentence? part of the old city walls around a city .
city, part, wall

What are the keywords in the following sentence? A waiter is working in a restaurant
restaurant, waiter, work

What are the keywords in the following sentence? mother and son mixing the salad in kitchen at home
home, kitchen, mix, salad

What are the keywords in the following sentence? turning wind turbines of a wind farm situated in the rural countryside
countryside, farm, turbine