Business English: A Practice Book by Rose Buhlig

10. An old story tells us that when Caesar, _who_ was

a great Roman emperor, returned from a conquest _which_ has ever since been famous, he brought back to Rome a formula _that_ has revolutionized the world. It was a formula for making soap, and was considered one of the greatest treasures _that_ was captured during the campaign. Caesar immediately saw the value _that_ it would have in the eyes of the world, and he forced the soap-makers to reveal their secret.