What are the keywords in the following sentence? missing angle in a triangle
angle, miss, triangle

What are the keywords in the following sentence? all i want for christmas is a sweater
christmas, sweater, want

What are the keywords in the following sentence? Herd of white animals in a distant field with water and mountains beyond.
animal, field, mountain, water

What are the keywords in the following sentence? i wanted to change the world .
change, want, world