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Mum, I want some toys.
煤
There was a rich （富有的） mother.
She loved her son very much.
Enjoy a story
Mum, I want a car.
After some days…
I give you some
____ to exchange（交换）a car.
oil
石油
Mum, I want some toys.
The son grew up happily.
His mother was happy too.
One day…
I give you some coal to exchange (交换)some toys.
coal
Enjoy a story
I want a car.
Some days later,…
I give you some
to exchange a house.
wood（木头）
I want a house.
Mum, I want a car.
After some days…
I give you some ____ to exchange
a car.
oil