What are the keywords in the following sentence? a helicopter in flight are preparing to leave a city its last remaining permanent base
base, city, leave, prepare, remain

What are the keywords in the following sentence? soccer player looks on dejected after his side lose during the match .
deject, player, side

What are the keywords in the following sentence? a shark leaping from the water
leap, shark, water

What are the keywords in the following sentence? heart shaped puff pastry in a dish
heart, pastry, shape