When it comes to (关于A所在的集合名词), I have to say there are many (I want to tell you about), such as àà……but these are not my choices. For …, I vote for A

　　I personally think …I personally don’t think ….

　　话题总述

　　方式(How1)

　　Chicken soup helps to fight a cold.

　　Special chemical stops a cold from getting worse.

　　People can get enough protein and be healthy by eating tofu, eggs, nuts.

　　Food gives people the chances to learn more about other cultures.

　　We use internet to communicate in many different ways.

　　It is good way to do sth

　　影响 (How2)

　　Overeating has negative/great impact on human beings’ health.

　　状态(How3)

　　it is good/unhealthy for sth/sb (not)to do

　　目的 (Why1)

　　the ancients used stone or wood to make tools.

　　I am writing a paper for my English class.

　　起因 (Why2) (对齐)

　　Chocolate causes pimples.

　　Eating too much and not exercising can cause us to gain weight.

　　Using too much of the energy may cause the problem

　　The cause is stress or not getting enough sleep.

　　Adding fattening things like butter to bread can raise the number of calories we eat.

　　We eat because we are hungry.

　　The reason why Americans love pizza is uncertain.

　　May be that’s why there are fewer people than I thought.

　　The mistake may lead to a serious accident.

　　Thanks for Chinese paper invention, people use money made of paper

　　条件 (Why3)

　　Without paper invention our lives would be very difficult.

　　If I get tired, my mother will let me get some sleep.

　　时间 (When)

　　People like to eat junk food when/before/after they are happy, sad or worried.

　　地点(Where)

　　I prefer eating in Chinese restaurants where I can enjoy the Chinese way of life

　　状态描述 (What)

　　It is a belief that …

　　it is wonderful/terrible experience that… /for sb to…(learn more about myself, see the world in a new way, change the way people work, learn, behave)

　　Food is life for sb to do sth

　　Chicken soup is a good cold remedy.

　　Soccer is one of most important games in the world

　　No one could work with greater intensity than Edison.

　　It is hard to imagine what life today would be life without computers.

　　A plays important/great part on (change the way people work, learn, behave, Communicate/the way of living/ the crime rate)