Crocodiles (鳄鱼) lay their eggs and leave them under leaves or sand. Baby crocodiles use their teeth {#blank#}1{#/blank#} (break) their way out of the shells.

    Crocodiles are {#blank#}2{#/blank#} (find) in Australia {#blank#}3{#/blank#}  America. They spend most of their time {#blank#}4{#/blank#} (lie) around in the rivers. The crocodile's long tail is used when the animal is swimming. It is {#blank#}5{#/blank#}  excellent weapon(武器). It can be used to strike(打击) the enemies. One blow will knock down a man or even a big animal at once. The crocodile has a hard neck. It cannot turn {#blank#}6{#/blank#}(it) head from side to side, so it can only see something in front of itself. The crocodile has its teeth {#blank#}7{#/blank#}(clean) by the crocodile bird. For its food this bird takes the bits in the crocodile's mouth. This helps the crocodile a lot, {#blank#}8{#/blank#} it cannot move its tongue up and down. With its terrible {#blank#}9{#/blank#} (tooth) it catches its food. The food may be a fish, an animal, or even a {#blank#}10{#/blank#} (careful) man.

    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.