More people like Living in a city now, especially young people who like new and modern things. Most people think it is much ____ （容易） to find work in a city . They think there are a lot of ____ (有乐趣的) things to do and places to see in the city . There are also many ____ (选择) of public transport. When they feel tired, they can eat in good restaurants, visit museums, go to cinemas and go to parks.

    ____ （然而）, in my opinion, living in the city will ____ (花费) more . What's more, the ____ (人口) of the city is getting bigger and bigger.  so it's a ____（遗憾） that the city is always ____ （拥挤的） noisy and dirty. And It is very difficult to find a good place where people can enjoy ____（和平） and fresh air. So We should ____ （改善） the serious situation.

若32×8³=2ⁿ，则n=____。

下面的微粒中，其中有一项不全是组成原子的微粒，应该是（　　）