The mobile phone is a useful thing, but maybe I don't know {#blank#}1{#/blank#} to use it. Sometimes it makes things difficult for me.

    One day I wanted to see my friend nearby. I could {#blank#}2{#/blank#}athis house in five minutes, but I thought it would be better to{#blank#}3{#/blank#}him up. I rang him for the first time, {#blank#}4{#/blank#} the line was busy.

    Five minutes later, there was an answer, but it was the wrongnumber. Then I tried {#blank#}5{#/blank#} and this time I got an answer from him. I  {#blank#}6{#/blank#} him if he was at home in the afternoon. And he said he would be at home all afternoon. So I went to his house, but then I found {#blank#}7{#/blank#} in. I called him for the fourth time. This time I got   {#blank#}8{#/blank#}angry that I said, “You are not at home? But you just told me over the telephone that you would be at home all afternoon!”

    Here was his {#blank#}9{#/blank#}, “No, I said: I will NOT be at home all afternoon.”

    I went back to my room. What{#blank#}10{#/blank#}could I do? Nothing!

    You may have heard of Niagara Falls（尼亚加拉大瀑布), but do you know about the Niagara Escarpment(断崖)?It's a long steep slope(陡坡){#blank#}1{#/blank#}runs through the US and Canada. Earlier this month, our school went on a hiking trip to this beautiful place.

    The weather was cold, cloudy and windy, so we wore more{#blank#}2{#/blank#}(stay)warm. We{#blank#}3{#/blank#}(divide)into two groups and went on different routes(路线). The whole escarpment is 725km long. But we only covered 8km for about four{#blank#}4{#/blank#}(hour).

    My favorite part of the trail(dx道)was the cave(山洞). The cave was formed from many different shaped rocks. Some were huge while the{#blank#}5{#/blank#}were small. We climbed down into the rocks{#blank#}6{#/blank#}the help of our teachers. The rocks were steep and slippery(滑的)because they were wet. It was{#blank#}7{#/blank#} exciting experience for all of us.

    After{#blank#}8{#/blank#}(walk)5 km without any rest, we were hungry and tired. {#blank#}9{#/blank#}our teacher finally said we could stop to have lunch, we were very excited. After all, this trail was a little different from the ones I'm used to. It was{#blank#}10{#/blank#}(natural)than before.