Here are the answers to the questions based on the text provided:
1. What was Tommy and Kevin's ambition?
Their ambition was to climb the Dawn Wall on El Capitan.
2. What is the Dawn Wall?
The Dawn Wall is a one thousand-metre rock face on El Capitan in Yosemite National Park and is known as the steepest, most difficult rock face in the world.
3. What is 'free climbing'?
'Free climbing' means using ropes and equipment only for safety and to catch climbers if they fall, but not using them to assist in the actual climbing.
4. How long did they train before attempting the climb?
They trained hard for six years before attempting the climb.
5. When did they attempt the climb?
They attempted the climb at the end of 2014.
If you need anything else, feel free to ask!