This math problem is        that one.

A. as difficult as                                              B. so easy as         

C. much difficult than                                       D. less easier than

This morning Jack came to school __________ than ________ student in his class.

A. much late; any                   B. much later; any other

C. much later; any                  D. much later; any other

I prefer skiing to climbing because I think climbing is __________ skiing.

A. not as exciting as               B. not more exciting as

C. not most exciting as             D. more exciting than

There are a lot         people today than yesterday．

A．of                B．most             C．＼                   D．more

The more exercise you take, ______ you will be.

A. healthy         B. the healthier       C. healthiest          D. the healthiest