我是英语老师，帮帮你。
1.No one understand why the murderer wasn't sentenced into death.
2.Once I set up my aim. I will never give it up.
3.No matter when you are in trouble ,you can ask me for help.
4.Iwill never forget the day that I climb up Mount Huang.
5.The pen that I used to write my first work hasn't been found yet.
祝你进步！
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