— He's of medium {#blank#}1{#/blank#} (high).

Seven {#blank#}1{#/blank#} (twelve) of the students have taken part in the tree-planting activity since Monday.

    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 that runs through the US and Canada. Earlier this month, our school {#blank#}1{#/blank#}(go) 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#}(separate) into two groups and went on different routes(路线). The whole escarpment is 725 km long. But we only covered 8kin for about four {#blank#}4{#/blank#}(hour).

    My favorite part of the trail(小道) 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){#blank#}7{#/blank#} they were covered with wet leaves. It was a fun and exciting experience for all of us.

    Another exciting moment was lunch. After {#blank#}8{#/blank#}(walk) 5km 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.

    Hiking is very interesting, but remember to stay warm, stay hydrated(保持体内水分)and have fun along the way! With these, you couldn't enjoy it any more.

    It is {#blank#}1{#/blank#} (say) if you do not use your arms or your legs for some time, they become weak. When you start using them again, they {#blank#}2{#/blank#} (slow) become strong again. Everybody knows that. Yet many people do not seem to know that memory works in {#blank#}3{#/blank#} same way.

    When someone says that he has a good memory, he really means that he keeps his memory in practice {#blank#}4{#/blank#} using it. When someone else says that his memory is poor, he really means that he does not give it enough chance {#blank#}5{#/blank#} (become) strong.

    If a friend says that his arms and legs are weak, we know that it is {#blank#}6{#/blank#} (he) own fault. {#blank#}7{#/blank#} if he tells us that he has a poor memory, many of us think that his parents should be responsible, and few of us know that it is just his own fault.

    Have you ever found that some people {#blank#}8{#/blank#} can't read or write have better memories? This is because they cannot read or write and they have to remember things; they cannot write them down in a little notebook. They have to remember days, names, songs and {#blank#}9{#/blank#} (story); so their memory is the whole time being exercised. So far a study has {#blank#}10{#/blank#} (show) that if you want to have a good memory, learn from the people: practice remembering.