How can I avoid placing two thats--one 'that' being a demonstrative pronoun and the other relative--in the same sentence? This is an example of the situation I'm talking about: ''That is the car that was stolen from Angel's back yard last week.'' I'm worried that the sentence sounds boringly repetitive; at the same time, I'm afraid of risking breaching a grammar rule, or at least an American English standard grammar rule, if I decide to replace the second 'that' with 'which.'