点拨：{#blank#}1{#/blank#}意为"除非，如果不"，引导条件状语从句，这是否定的含义，相当于{#blank#}2{#/blank#}。如：

My sister never cries unless she is hungry. ＝{#blank#}3{#/blank#}

The artist is good at {#blank#}1{#/blank#} the painting brush．

Some of the students went swimming, and {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} them went to play football.

What can we do to {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#}?

I'm just {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} you are.