Many students in the US always {#blank#}1{#/blank#} the bus to school every day. Parents think taking the school bus is very {#blank#}2{#/blank#}. But sometimes it is also dangerous(危险的). Some students were injured (受伤的) {#blank#}3{#/blank#}they didn't follow the school bus rules. What are the school bus {#blank#}4{#/blank#}?

{#blank#}5{#/blank#} at the bus station early.

Wait {#blank#}6{#/blank#} the bus at the bus station.

{#blank#}7{#/blank#} play around the bus station.

Don't run here and there at the bus station.

Don't walk {#blank#}8{#/blank#} fight on the bus when it is going.

Don't get off the bus if it doesn't stop.

{#blank#}9{#/blank#} rules are good for students. Follow {#blank#}10{#/blank#}, and you can keep yourself safe.

A：Hey,John!What's the{#blank#}1{#/blank#}?

B：It's four{#blank#}2{#/blank#}．

A：It's so{#blank#}3{#/blank#}．Let's play computer games．

B：Oh no.It's boring．

A：So,what do you want to do?

B：How about doing our{#blank#}4{#/blank#}in the library first?

A：OK．

B：After that，let's take a(n){#blank#}5{#/blank#}at school．

A：Sounds good．Let's go．

    Do animals have their culture? What do we mean by "culture"? Recent years social scientists have begun to ask if culture is found just in humans, or if some animals have their culture too. When we think of culture, we mean a way of life that a group of people have in common(共同的). Culture is the {#blank#}1{#/blank#} and beliefs(信仰) that a country or a group has. It is the way of behaviour that helps people live together. It is also the way of behaviour that makes a group of people {#blank#}2{#/blank#} other groups.

    Our culture makes us lose strength, claws(爪子), long teeth, and other defenses (防卫). Instead we use tools, cooperate(合作) with {#blank#}3{#/blank#}, and communicate with language. But this kind of "culture" can also be found in the lives of some animals. Animals can also make tools, for example. We {#blank#}4{#/blank#} think that the ability to use tools was the dividing line(分界线) between human beings and other animals. However, we have found that is not like this. Some animals can not only use tools but also make tools themselves. Animals can also share knowledge with each other and use their own language to communicate. So it may be important for us to know that the line dividing us from animals is not as clear as we used to think.