大家帮我看看这篇英语短文有没有问题

Riding the horse on the grassland
During the trip,I also had an unforgettable experience:riding the horse on the grassland.It was the first time I rode the horse alone.
The horse which would be ridden by me was a brown(and去掉) beautiful horse.And,it was very small,it was the smallest horse I have ever ridden..At first,I was afraid of falling down from the horse.I was very nervous and couldn’t draw myself up.But,after nearly half an hour for(of) practicing(practice),I knew how to ride a horse.I began to ride the horse and enjoyed the warm sunshine happily.
I had a good time on the grassland.What a happy life the people there have!你告诉我在那里改了我晕，最前面一段有一点修改，后面的我加括号了，麻烦第二段也帮我看看The end of the summer holidaySummer holiday will （be finished）改成OVER soon. The homework has almost (加上been) finished. During the summer holiday, I learnt a lot, broaden my mind by travelling and help(此处加，ed是过去对吧) others (by)改成 to do (doing去掉)work (加上as a volunteer此处是我帮你改的，我觉得这样比较好). Now, it’s the end of the summer holiday,a new term is coming. The first thing of the new term is the test which can detection（这个要用动词detect） our homework.I hope I can have an interesting new term.Let（加上'S ）cheer for it!