What are the keywords in the following sentence? car travels over steel lift bridge on the canal
bridge, canal, travel

What are the keywords in the following sentence? rock formations off the coast support small forests of hardy trees
forest, support, tree

What are the keywords in the following sentence? welcome your new daughter in law to the family with something thoughtful
daughter, family, welcome

What are the keywords in the following sentence? theater was built in a city .
build, city, theater