—{#blank#}1{#/blank#} do I. That's probably why I'm becoming healthier and healthier now.

    Once upon a time, a group of men came to a rainforest. They would{#blank#}1{#/blank#}(参加) a race there. One night, when they sat down for food,{#blank#}2{#/blank#}dog appeared. Slowly, it came{#blank#}3{#/blank#}(靠近，接近) them. It looked hungry, so they gave it some meat. As a r{#blank#}4{#/blank#}, the dog followed them everywhere.

    The men{#blank#}5{#/blank#}(加快速度) many times to prevent the dog{#blank#}6{#/blank#}following them. But each time{#blank#}7{#/blank#}(赶上) them. They went{#blank#}8{#/blank#}with their race, which included hiking, c{#blank#}9{#/blank#}a mountain, and running. It lasted for several days.

    One day, they went boating to a destination(目的地). They thought the dog might {#blank#}10{#/blank#}(放弃). Surprisingly, the dog jumped into the river and swam towards their boat. They were so m{#blank#}11{#/blank#}by the dog that tears came to their eyes and they let the dog into the boat.

    When the race was over, they were all t{#blank#}12{#/blank#}, and wanted to have a rest.Just then, they found the dog was covered with wounds. {#blank#}13{#/blank#}save the dog, they decided to take it to the hospital. After it r{#blank#}14{#/blank#}the treatment, it got better soon.

    Now the men regared it as one of their family{#blank#}15{#/blank#} /ˈmɛmbəz/.

    Do you know the differences between the new buildings and the old ones?

    Old buildings h {#blank#}1{#/blank#} brick and stone walls. The walls hold up the buildings. In cities, many modern buildings l {#blank#}2{#/blank#} as if they are made just of windows.

    Walls of dark glass reach high into the air. Many buildings are m {#blank#}3{#/blank#} than 50 stories tall.

    Are walls of glass strong e {#blank#}4{#/blank#} to hold up the new building? No. The new glass walls do not hold up the buildings, but they only cover up the frame made of steel. Have you ever watched a new building going up? The steel frame is built f {#blank#}5{#/blank#} . Then the glass walls are hung on the frame. When the building is f {#blank#}6{#/blank#} , the frame does not show. The outside looks like windows without walls. The glass walls s {#blank#}7{#/blank#} in the sun with no decoration. Many people find them beautiful just as they are.