听录音，排序。
{#blank#}1{#/blank#}They sell many different things.
{#blank#}2{#/blank#}This one is heavy.
{#blank#}3{#/blank#}Let's go to the supermarket.
{#blank#}4{#/blank#}You're helpful children.
{#blank#}5{#/blank#}They sell many things from China, too.
