义务教育不同于高等教育、成人教育等其他教育,具有自己的显著特征。下列选项不属于义务教育特征的是 ( )
_______ a small number of Australians are bitten by spiders each year, most recover without any medical treatment.
This morning I saw an old friend of mine in the street by ______.
Everyone should _______________ the environment.
—Listen, Lily is playing the piano! —Wow, how sweet the music ______!
________ tomorrow, I would take a bus to school.