ai giải giúp mình mấy câu này với ạ . : Combine these pairs of sentences. Use a relative pronoun only when necessary. Use commas for non-defining relative clause. 1. 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 2. My new cell phone has become a necessary part of life. I only bought it a month ago. - 3. My roommate has never been on the Internet. She is afraid of computers. - 4. Now, there are psychologists. They help technophobes use technology. - 5. A lot of people suffer from techno stress. Those people work in my office. - 6. Some people dream of a job. They can do the job without technology. - 7. My stereo doesn’t work today. It worked yesterday. - 8. The man is a computer expert. You were talking to him. - 9. Some documents have been found. They were stolen from a car. - 10. Dr. Michelle Weil wrote a book about ‘techno stress’. She is a psychologist. - 11. He works for a computer magazine. The magazine is very popular in Mexico. - 12. Marta has a brother. Her brother’s name is Manuel. -