英语问题，急！！

改同义句

1）
I bought a new MP4 and its price is 300 yuan。

2）
I am no longer a little child。

3）
I'd like to go by train，not by air。

4）
He didn't admit breaking the window。

5）
In the end，they found the black bag in the box。

I bought a new MP4 and it costs me 300 yuan. I am not a little child any more. I prefer to go by train rather than by air.

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