How to use "devoted his whole life..." ?

What does this question mean? Question: Please circle any of the following that you think is important in the growth of a company. Choices: Comapny, Service and product. So does this question mean that I only can choose one from the choices or it's a multiple choices? I feel like they are all important. Thank you a lot!

how do you refer others in a group? Can I always use "guys" to mention all people in a group? even if the group includes people much older than me? Or how should I appropriately refer to people together in a group? BTW, did I use "refer" wrongly here?hmm Thank you!

How do you improve your writing skills, especially second language writing? I've been learning English for many years, but my writing is really a mess. I just realize that in fact I have never specifically trained my writing skills. So I'm curious about how you guys sharpen writing skills, hmmm..Have a nice day  

Which English song do you often listen to lately?:)     Hi, italkians, how are you doing?Welcome to share your favorite English song here. Cheers!

Short Translation (1) Morse's syndrome is one of the few known second viral disease. Its early and second phases are respectively caused by two different kinds of viruses or two in morphologically distinct development phases. The pathogenic virus of the early phase is TX-Ⅱ2 which can inhibit the diffusion of β reto-acid in cells (especially in the epidemic period). The virus of the second phase is TX-Ⅱ3... Though Morse's syndrome is generally accepted as a kind of mild illness in children, medical studies reveal its serious harm injuring patients' bodies after the disappearance of the mild symptoms in the early stage. At this point, visual impairment, unresponsiveness and even brain damage happen to patients

My first language partner (1) At the beginning of using italki, it was not easy for me to find a native English speaker. I hadn't found one suitable partner for two months. Being very disappointed, I wanted to give up this website and language exchange. Then, I received one message from Jeremy. I was very excited and arranged the practice time. It was the first time to exchange language for both of us. We practiced everyday and explored the better way to improve the practice method.

Wasting Food Yesterday my teacher talked about his experience in America. Everytime when teachers tell us the differences between western people and Chinese people, I wonder whether it's true, haha. He said that in American restaurants if there was food left in your plate when you left, then everybody would dart a contemptuous look at you. "It is really great that people supervise each other on wasting food in America." Is it true?

Practicing Writting Though I've learned English for nearly ten years, my English writting is very poor. Some people hold that if you write more your writting skill can be improved.(Is it true?haha). During my school life, I've written many articles. But most of them are compulsory. When I write them I've used to follow the pattern "topic-first-second-third" because I only want to finish the task as soon as possible. By using that pattern I waste many chances to practice writting. Now I really get tired of my dull and boring articles so I decide to write a short essay here everyday. I don't know how long I can insist this time but at least I start changing, haha.