Ⅰ、thickest:deepest, longest, highest
nicest: largest, widest, hugest
saddest: biggest , wettest, fattest
friendliest: heaviest , thirstiest,
earliest
most famous: most popular ,
most dangerous ,
most nervous
Ⅱ、1、long
2、the most dangerous / popular
3、the most famous
4、the biggest / largest
5、thick
Ⅲ、the largest, larger / bigger, the longest, long, wide,the most famous