有冇錯~~please!!

1. because I worried ＊other＊ people would steal it
another係用黎指「一個」其他人, people係眾數~

2. and I ＊didn’t＊ want to share it with ＊other＊ people

3. Moreover, the carpet was rare in ＊the Earth＊.
地球係專有名詞, 所以要加 the 同大寫開頭~

4. and I ＊hid＊ it in my bedroom.
hide的過去式係hid~

吾知哩句我有冇誤解你意思：
5. I had gone to a forest ＊at once＊.
at once係指即刻。
I had gone to a forest ＊once＊
淨係once的話就指「曾經」。

6. The forest of trees ＊were＊ very tall
trees是眾數~

7. and I found out a lot of rare plants in the forest.
我刪左你句「in the plants」。

8. 第一, There ＊were＊ lots of animals
animals係眾數~ 吾用there was~ 用there were~
第二, 我建議哩句你改成咁：（你本身句有ｄ怪）
There ＊lived＊ lots of animals.

Many errors were missed in this answer.
You cannot say IN the Earth, have to say ON Earth. In the earth 會令人誤會泥土中.
用y-TheHelper個答案啦, 佢個無錯

I have never told anyone that I have gotten a magic carpet, because I worried that it would be stolen and I did not want to share it with others too, perhaps I was selfish, nevertheless do you know how rare it is. After coming home, I hided it in my bedroom and use it every holidays.
Once（at once是立即的意思，並不是有一次的意思 ), I went to a forest（wood 也可以，wood 指樹林，而forest是森林), where tall and scarce trees were everywhere, abided with a lot of animals. Suddenly, I was chased by a tiger.

2006-10-23 15:19:00 補充：
對唔住，hided 應該用hid，因為hid 才是hide的過去式

I did not tell anyone that I have got the magic carpet, because I worried other people would steal it, and I did not want to share it with other people too. in short, I am selfish. Moreover, the carpet was rare in the earth. I went back home and I hid it in my bedroom. I took advantage of it on holidays.
I had gone to a forest at once. The trees in the forest were very tall, and I found a lot of rare plants in the forest. There were lots of animals lived there. I was chased by a tiger.

ks

I (did not tell) anyone (about) the magic carpet because I (was) worried (that other) people would steal it. I (did) not want to share it with (other people). (In) short, I (was) selfish. (Anyway), the (magic) carpet was a rare (one) (on) earth. After I went (back home), I (hid) it in my bedroom. I took advantage of it on holidays. I (flew to the) forest at once. The trees (were) very tall and I (found) a lot of rare plants in the forest. There (were) lots of animals (living there too). I was (once) chased by a tiger.