What's the most popular school activity among American students? The{#blank#}1{#/blank#}  is the school dance. Most American high schools have at least two dances {#blank#}2{#/blank#}  the year, one in winter and the other in spring. Students attend these events {#blank#}3{#/blank#}  it's a great opportunity for them to meet {#blank#}4{#/blank#}  friends.
     At the dance, there will be snacks and photo booths (机器拍照亭), as well as strict（严格的） rules to {#blank#}5{#/blank#}  create a healthy and enjoyable evening for all students. And all the dancers will be given a security check（安检）before they come into the dance {#blank#}6{#/blank#} . This is acceptable. But some rules may be a little bit over the top（过分). For example, a school once asked {#blank#}7{#/blank#}  students to keep a standing position while they were dancing. That {#blank#}8{#/blank#}  the students couldn't do anything freely. You'd {#blank#}9{#/blank#}  not break the rules because you'll be asked to leave there, or even worse, be placed on a do not invite list.