5. Slow - slower - the slowest.
Remarkable - more remarkable - the most remarkable.
Tall - taller - the tallest.
Young - younger - the youngest.
Good - better - the best.
6. Red Square, the Kremlin, the Tzar Bell, America, Korolev Street, the USA, the Volga, the Black Sea, Everest, Russia, Japaneese, my friend, happy, Lake Baikal, the Alps.