I. Change the following sentences into the passive voice.(chuyển sang câu bị động). 1. People spend a lot of money on advertising every day. .................................................................................................. 2. The police haven't found the murderer yet. .................................................................................. 3. His father will help you tomorrow. ................................................................ 4. Peter broke this bottle. ............................................... 5. They are learning English in the room. ....................................................................... 6. Did the teacher give some exercises? ....................................................................