1- correct
2- correct
3- correct
4- cheaper and cheaper
5- as usual
6- the more tired he becomes, the more . . . . .
7- is much older than. .
8- further*
9- correct
10- as expensive as. .
11- correct
12- more and more bored
13- in the world
14- is the most famous. .
15- nicer when he's asleep