III. Look at the signs. Choose the best answer (A, B, C or D). (15-16)Câu hỏi Look at the signs. Choose the best answer for the question. A. You need to ask for permission when you want to use the computer. B. You must ask for a computer when you go to Viva Library. C. You have to be a member of staff in order to use the computers. D. A member of staff will give you a computer.