The Great Pyramid of Giza is one of the Wonders of the Ancient World. It was b{#blank#}1{#/blank#}more than 4, 000 years ago in Egypt. It is so p{#blank#}2{#/blank#}that millions of tourists from around the world come to visit it every year.

In Egypt there are over 80 pyramids and the l{#blank#}3{#/blank#}one is the Great Pyramid. It l{#blank#}4{#/blank#}on the west bank of the Nile. In fact, all the pyramids along the Nile are on the west bank. The ancient Egyptians compared the rising of the sun to beginning of life and the setting of the sun to the end of life. That is w{#blank#}5{#/blank#}their dead bodies were buried(埋葬)on the west bank of the Nile.

    You can h{#blank#}6{#/blank#}imagine how huge the Great Pyramid is. It has over 2 million blocks. Some are as heavy as five school buses. A {#blank#}7{#/blank#} they were heavy, workers were able to put a block into the pyramid every three minutes.

    The workers, Egyptian men and women, worked in teams. The teams had different t{#blank#}8{#/blank#}. Some dug up the stones. Others moved them. Another team cut the stones. The last group put the stones into the pyramid. There were so many different teams, but the pyramid is perfect. No stone is in the w{#blank#}9{#/blank#}position.

    But how did the Egyptians move those heavy stones to the top w{#blank#}10{#/blank#} any modern machinery(机械)? No one knows for sure. Many things about the Great Pyramid are still a mystery.

    Many people have cars in the city. But {#blank#}1{#/blank#} (污染) is a problem because of the cars. Nowadays some downtown(闹市区的) areas around the world don't have cars. These car-free zones(无车区) are areas for people, bicycles and {#blank#}2{#/blank#} (公共的) transportation only. Eight million people  {#blank#}3{#/blank#} (居住) in the center of London and another two million people go to work there every day. The downtown area is very {#blank#}4{#/blank#} (吵闹的) with hundreds of cars, buses and taxis, but there are {#blank#}5{#/blank#} (也) a lot of beautiful parks with free music concerts. Many people go there for a rest {#blank#}6{#/blank#} (在……之后) they get off work. Parts of Tokyo are always crowded with hundreds of people- but no cars! These modern car-free zones are {#blank#}7{#/blank#} (真正地) popular and people like shopping there. In the past, Bogota was polluted {#blank#}8{#/blank#} (因为) there were lots of cars and traffic. Now the downtown area is a car-free zone and the air is {#blank#}9{#/blank#}(干净的)! Many people don't have a car and half a million people take the bus to work. There are lots of stores. It's not {#blank#}10{#/blank#}(昂贵的).