24. I bought a cell phone. I can use it to send and receive e-mail.
-> I bought a cell phone which I can use to send and receive e-mail.
25. Some documents have been found. They were stolen from a car.
-> Some documents, which were stolen from a car, have been found.
26. He works for a computer magazine. The magazine is very popular in mexico.
-> He works for a computer magazine which is very popular in mexico.
27. My roommate has never been on the Internet . She is afraid of computers .
-> My roommate , who is afraid of computers , has never been on the Internet.
28. She couldn't come to the party. This is a pity.
-> She couldn't come to the party, which is a pity.