用所给单词的适当形式填空.（每空不止一词）
1.this bed is_____.
but mine is_____than yours.(comfortabla)
2.you study_____(well) than last year.
3.my shoes are_____(beautiful)of the three.
4.unit 2 is_____than unit 1.
but unit 5 is_____in book11.(difficult)