I'm glad to receive your email. As it is required，you are supposed to hand in the poster before next Friday.
Being your close friend，I am extremely willing to share some ideas about designing the poster with you.First and foremost，the basic safety rules are of great importance，which should be included in your poster.In the second place，following the safety rules is so meaningful and crucial that you had better remind your readers of its significance and advise them to be careful both in and out of school.Last but by no means least，if I were you，I would add a few suggestions about safety awareness，considering that better safe than sorry.In addition，it is a good idea for you to draw a few pictures on your poster so as to make it more lively and acceptable.
If there is anything more that I can help with, please let me know.
Self-discipline plays an important role in our life. To be honest, I am a person who is self-disciplined. I used to follow all kinds of rules and hand in the tasks appointed on time at school. And I could not only respected all my teachers but also get on well with my classmates. At home, I was able to balance housework and homework. I usually made a plan in advance to make it easier to achieve my goal. After finishing all the task, I developed the habit of going to bed early and going to bed early. In the society，I spared no effort to improve myself all the time.
In a word. I have benefited a lot from being self-discipline. First of all, I have had many good habits, which makes my life easier and more regular. Secondly, my life and my study have been to high efficiency so that a lot of time has been saved. Thirdly, being self-disciplined has prepared me for a better and brighter future. In the future, I will continue to be a self-disciplined person.
First of all，Firstly/First，Secondly/Second…
And then，Finally，In the end，At last
What is more，Besides，Moreover，Furthermore，In addition
However，On the contrary，but，
Although+从句，In spite of+n/doing
On the one hand…On the other hand…
Because，As ，So，Thus，Therefore，As a result
In other words
For example+句子，For instance+句子，such as+n/doing
As far as I know，In my opinion
In short，In a word，In conclusion，In summary