1. which is (heavy) of all land animals? The elephant/the giraffe 2. which river is (long) than the Amazon? The Nile/The Volga
3. On which continent is (hot) place on Earth? Africa/North America
4. which country is (big) in size that the USA? Russia/Australia
5. which continent receives (little) amount of rain every year? Antarctica/Europe
6. which European city is (populated) than London? Moscow/Rome
1 the heaviest. elephant
2 longer. The Nile
3 the hottest. Africa
4 the biggest. Russia
5 the least. Europe
6 more populated. Moscow
надеюсь и всё верно, удачи!