More than millions of years ago, there were deserts. Now about one fifth of the Earth's surface {#blank#}1{#/blank#} (be) deserts. The size of the world's deserts keeps {#blank#}2{#/blank#} (change). Deserts can be hot or cold. The Australian Desert is a hot desert, while the Gobi Desert is a cold desert. A desert is a very dry land and there is hardly any rain. The Sahara Desert in Africa receives less than 1.5 cm a year. {#blank#}3{#/blank#} it doesn't rain very often in deserts, sometimes even for years, there can be heavy rain suddenly. Because they are dry, deserts have wide changes in temperature each day. When the Sun goes up, it is very hot, even hot enough {#blank#}4{#/blank#} (fry) an egg on the ground. At night, the heat that {#blank#}5{#/blank#} (receive) by the ground during the day disappears {#blank#}6{#/blank#} (quick), and then it gets {#blank#}7{#/blank#} cold that water would turn into ice. Because {#blank#}8{#/blank#} the change, living in the desert is very difficult. Man can make deserts, but man can also stop {#blank#}9{#/blank#} (they) from getting larger and larger. Planting trees can prevent the sand from {#blank#}10{#/blank#} (spread).

    Water is very important to living things. {#blank#}1{#/blank#}(with)water, there can be no life {#blank#}2{#/blank#}the Earth. All {#blank#}3{#/blank#}(plant)and animals need water. Man also needs water. We need water {#blank#}4{#/blank#}(drink）, to cook food and to clean {#blank#}5{#/blank#}(us). Water is needed in farms, factories, offices, schools {#blank#}6{#/blank#}families.

    Water is found in seas, rivers and lakes. It can be found everywhere {#blank#}7{#/blank#} the world, {#blank#}8{#/blank#} it can also be found in the air. We cannot see or feel the water when it is part of the air. Clouds are also {#blank#}9{#/blank#}(make)of water. They are little drops of water. When water {#blank#}10{#/blank#}(freeze), it becomes ice. So ice is also water.

    Members of the {#blank#}1{#/blank#} (help) Hands Club usually do a lot of things.

    Last Saturday, some members {#blank#}2{#/blank#} (clean) up the parks and others went to old people's home. Mr. Wu is the teacher in the club. He often {#blank#}3{#/blank#} (collect) things for Project Hope with ten students in the street. Next week, all the members in the club plan {#blank#}4{#/blank#} (have) a party with the students in a Hope Primary School. And they {#blank#}5{#/blank#} (grow) some flowers along the road. They hope the flowers will make the town more beautiful.