1.b> , , ; ; tough and scaly skin of the lizard i> ; a tough pair of boots i> ;
2.b> , ( i>);
3.b> , i> ; / ; you need to be tough to go climbing in winter ;
4.b> ; a tough law ; to be too tough on smb. ;
5.b> , ; ; it will be a tough decision to make ; he's had a tough time of it recently / .