Fill each gap with one suitable word to complete the conversation.
Nam: Phong, I learnt an interesting word from school today, ‘megacity’.
Phong: ‘Megacity’, like in the (1) ‘megabyte’ or ‘megadeath’?
Nam: Right. A (2) is a very large city with big population.
Phong: Is our city a megacity?
Nam: No, I think it’s too (3) to be called ‘megacity’.
Phong: Can you name some?
Nam: My teacher named some. (4) are Manila, Tokyo, London ...
Phong: And New York, and Shanghai, and ...
Nam: How do you know them?
Phong: I read about the (5) cities in the world. But I don't know they are called megacities.