阅读下面短文，根据文章大意用所给单词的适当形式填空（未提供单词的，限填一词），使文章意思完整、正确。
We
live on Earth. It's {#blank#}1{#/blank#} (we) home. But how much do you know about {#blank#}2{#/blank#}?
Let me tell you something about our Earth.
The
Earth is like a huge ball. Like {#blank#}3{#/blank#} other seven planets, the Earth is {#blank#}4{#/blank#}
(run) around the Sun. It's the third nearest one to the Sun. It {#blank#}5{#/blank#} (take)
the Earth a year to run around the Sun. At the same time, the Earth is going
around itself. If you are in space, you can see {#blank#}6{#/blank#} (lot) of white clouds
over the surface of the Earth. Through the clouds, you can see the blue colour
of the {#blank#}7{#/blank#} (ocean), and the brown colour of the land. About 70% of the
Earth {#blank#}8{#/blank#} (be) covered with water.
Why
do we have day and night? When the half {#blank#}9{#/blank#} the Earth is facing the Sun,
it's daytime. As the Earth {#blank#}10{#/blank#} (turn), and this half is away from the Sun,
night is coming. And it's daytime for the other half.
