1. We need to fulfill our lives with our own hands.
2. Maybe it is enough for me just to look at you quietly.
3. Please forgive my hastiness when replied your letter that day.
【没有用mind,用的forgive,感觉这样更真诚
4. I hope you can face the days that stretch before you positively no matter what happens, I'll always keep you in my mind.
5 The reason why I use Chinese is that I don't know how to express some of my feelings in English. Meanwhile I'm a Chinese so I can use Chinese language accurately and freely.
【如果你不是做题,要逐字对译,而是给外国人写信的话,建议这句话这么写：The reason why I use Chinese is that I don't know how to express some of my feelings in English. Meanwhile I can use Chinese to deliver my thoughts accurately and freely.】
6. The feeling I have for you is just a simple kind of fondness. I don't want to bother you and I just hope that everything will be fine with you!
希望能帮到你,有问题欢迎追问~