Which sentence correctly uses the comparative form of 'fast'?

• The cheetah runs fastly than the lion.
• The cheetah runs faster than the lion.
• The cheetah runs fastest than the lion.
• The cheetah runs more fast than the lion.

The tallest building in the world is an example of the superlative form.

What is the superlative form of 'good'?

• best

Which word completes this sentence: 'Mount Everest is ______ mountain in the world.'?

• high
• higher
• highest
• more high