Ответ:

Решение:

  1. Is Africa bigger than Australia?
  2. Are their cities older than ours?
  3. What is the longest river in the UK?
  4. They were the happiest children in the world.
  5. Where do we have the coldest winter in the world?

Ответ: 1. bigger, 2. older, 3. longest, 4. happiest, 5. coldest