What are the keywords in the following sentence? flock of swans on the lake
flock, lake, swan

What are the keywords in the following sentence? happy students in their classroom receiving the donated products
classroom, receive, student

What are the keywords in the following sentence? you can tap sweet birch trees like this one in late winter or early spring .
spring, tap, tree

What are the keywords in the following sentence? A few baskets of food, including a pizza, some vegetables and dip, and a sandwich
basket, food, sandwich, vegetable