本周考试，请教语法题~！谢~！

单选：

Commercial expansion from city to suburb has affected the way people in the united states_（定语从句）_people in the united states live and work in the way.___

A. living and working

B.live and work

答案选B，why？为什么不选A

改错：

1. The strength, size, and surefootedeness of the llama make it as excellent beast of burden in mountanous regions today as it was in the past. (excellent怎么改？？)it as excellent a beast of burden

2.Edwin Franko Goldman was the first bandmaster to ecourage leading contemporary compositions to write original works for a band.(不知道该怎么改) compositions 指作品composers指作家

3.The eight stripes of red, white, and blue on state flag of Hawaii represent Hawaii's eight major islands.(on the state flag??怎么改?)

要考试了，谢大家帮忙解答~  on the state flag