Thousands of years ago，human(人类)didn’t live in towns．Sometimes they would live in caves(洞穴)or build camps in the forest．
Only about thirty people1 in each camp．The men would go hunting while the woman and children2food from trees around the camp．All the food was 3 among people in the group．Every few weeks they moved to another place to find more food．It was a simple life，but people had to be 4 .They had to make everything that they needed，and they had to know a lot about plants and animals．
Nowadays most people live in towns and cities，and they work in offices and factories．Life is 5than in the old days．There are fewer 6，but there is less excitement．Some people go7  excitement  sailing round the world．climbing mountains，or exploring(探测)caves．
Most people look forward to the8,a time when they can enjoy a change from the normal life．For some this means going camping．But camping today is 9 from camping in the past．Gas cookers，ready-made food and air-beds mean people can camp much more10 than they did in the old times．

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    When you are in Hong Kong，you must be very careful in the streets because the traffic drives on the left．It is different from that in other areas of China．If you are the first time to come to Hong Kong，you must look to the right side and then the left before you cross the street．If the traffic lights are red，the traffic must stop．Then people on foot can cross the road carefully．But if the traffic lights are green，the traffic can go，people on foot mustn’t cross．

    When people go to or come from work in the morning and evening，the streets are very busy．

    Traffic is the most dangerous then，especially (尤其)for the children．

    When you go by bus in Hong Kong．you have to be careful，too．You must always remember the traffic moves on the left．So you must be careful．Have a look first，or you will go the wrong way．

    In Hong Kong，there are many big buses with two floors，you can sit on the second floor．From there you can see the view of the whole city well．It’s very interesting．

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