Martin is a manager. His computer and phone {#blank#}1{#/blank#}(be) important for him. In the office, he {#blank#}2{#/blank#} (work) on the computer. When he isn't in, he can work on {#blank#}3{#/blank#}(he) phone. How can he do that? The phone can work like {#blank#}4{#/blank#} (冠词) computer. That's really good {#blank#}5{#/blank#} (介词) his work.

    Clothes are traditionally made of natural materials, such {#blank#}1{#/blank#} cotton, leather and wool. They are all from plants or animals, but that doesn't mean they are {#blank#}2{#/blank#} (friend) to the earth. For example, farmers sometimes have {#blank#}3{#/blank#} use a lot of chemicals to grow cotton plants.

    Scientists now {#blank#}4{#/blank#} (look for) new ways to make clothing materials. They hope the new materials are both comfortable and good for the earth. So far, scientists{#blank#}5{#/blank#} (work) out how to make materials out of corn husks (壳), chicken feathers and rice straws. I think more and more people will like to buy these kinds of clothes.