What are the keywords in the following sentence? assorted colourful boats and the lifeboat at anchor in harbour
anchor, boat, harbour

What are the keywords in the following sentence? Large red and purple bird sits on end of branch in outdoor setting.
bird, branch, end, sit

What are the keywords in the following sentence? vets examining cats in a hospital
cat, examine, vet

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