What are the keywords in the following sentence? hippos that are cooling off in the water
cool, hippos, water

What are the keywords in the following sentence? smoke rises as security personnel guard near the building after a deadly attack .
attack, building, rise, smoke

What are the keywords in the following sentence? A city with tall buildings and a large clock tower.
building, city, tower

What are the keywords in the following sentence? religious leader prays during a visit at basilica in italian comune
basilica, leader, pray