Being safe at school and in your everyday life needs knowledge. If you remember the following information，your life will be much safer.

    ●Always notice the environment around you. You shouldn't walk alone outside. ____ If anything dangerous happens，you can find them quickly.

    ●Don't use earphones(耳机) when running in the school yard or on the street. ____    

    ●School bags should be carried towards the front of your body instead of pulling them on your back. ____ 

    ●If you are followed by a stranger(陌生人)，cross the street and go in the other direction(方向)，let the stranger know that you know he or she is there. Next，go and get help from others if it is necessary. ____You are safer on the street than you are in your home or in a lift.

    ●If you have to take a bus to a place far away，try to get to the bus stop a few minutes before the buses leave. ____ On buses，don't sit alone，sit behind the driver or with friends. Don't sleep.

从18世纪60年代开始，人类经历了三次科技革命。下列对三次科技革命表述正确的是

①第一次科技革命使人类进入了“蒸汽时代”

②第二次科技革命使人类进入了“电气时代”

③第三次科技革命把人类带入了“信息时代”

④三次科技革命都涌现了大量的科学成果，推动了知识变为物质财富的进程（   ）

填写合适的关联词语。

①____莫泊桑记住了老师的话，勤奋努力，____写出了许多优秀作品。

②我们____要把“八荣八耻”牢记在心上，____要落实在行动上。