1) A:In Kazakhstan is very cold.
B: Yes, but in Greenland is colder than Kazakhstan.
A: Antarctida is the coldest of all.
2)A: Cars are very fast.
B: Yes, but trains are faster than cars.
A: Planes are the fastest of all
3) A: The Yangtze River is very long.
B: Yes, but The River Amazon is longer than The Yangtze one.
A: The River Nile is the longest of all.