What are the keywords in the following sentence? thick roots radiate from the base of a tree in the rain forest .
base, forest, tree

What are the keywords in the following sentence? beef with onions and chinese noodles cooked in a wok
beef, cook, onion

What are the keywords in the following sentence? teacher helping a high school student with a task .
help, student, task

What are the keywords in the following sentence? it also was the first industrial site to use reinforced concrete in its construction
concrete, reinforce, site