Exercise 3. Look at the clocks and answer the questions.
(Nhìn các đồng hồ và trả lời các câu hỏi.)
1. In which countries are cities 1-6?
2. Is New York ahead of or behind GMT?
3. How many hours ahead of GMT is Hà Nội?
4. How many hours behind GMT is Brasilia?
5. If it's 12 p.m. in London, what time is it in Brisbane?
6. You are in New York at 9 p.m. Is it a good idea to call your friend in London? Why / Why not?