Infinitive is to keep. use is adverb. hope it helps.
A. EXPORTING: send goods to <em>another country</em> <em>for sale</em>. "The owner of an athletic retailer would <em>to sell</em> her products in <em>Europe</em>."
B. PARTNERSHIP: an agreement between organizatios, people etc to work together. "Chery will help Jaguar Land Rover"
C. OUTSOURCING: a company employs <em>another organization</em> to do some of its work rather than using its own workers to do it. "Nike manufactures their shoes in <em>Chine and Vietnam."</em>
I would say relative pronouns
