8. sad - sader - the sadest

happy - more happy - the most happy

big - biger - the bigest

dry - drier - the driest

old - older - the oldest

complete - completer - the completest

little - littler - the littlest

ugly - uglier - the ugliest

low - lower - the lowest

heavy - heavier - the heaviest

strong - stronger - the strongest

famous - more famous - the most famous

messy - messier - the messiest

polite - more polite - the most polite

slow - slower - the slowest

tall - taller - the tallest

young - younger - the youngest

good - better - the best

hot - hotter - the hottest

tasty - tastier - the tastiest

large - larger - the largest

high - higher - the highest

busy - busier - the busiest

9. This coffee is very weak. I like it a bit stronger.

The room in the hotel was really big. I expected it to be smaller.

The weather is too hot in this city. I'd like to live in somewhere colder.

Your work isn't very good. I know you can better.

10. This is the strongest coffee I have ever tried!

This is the oldest church in my city.

Everest is the highest mountain.

Russia is the biggest country in the world.