How and what: don't mix them up!
1/ --- a wonderful play!
2/ --- huge that gap is!
3/ --- exciting!
4/ I didn't realise --- a selfish person he was!
5/ --- interesting...
6/ --- fast he can run!
7/ --- a ridiculous hat...
8/ --- a dramatic story...
9/ She didn't know --- expensive it would be!
10/ --- a long distance to cover in a few days...