They {#blank#}1{#/blank#} {#blank#}2{#/blank#} an unknown world. No one knows them.

I usually sleep for{#blank#}1{#/blank#} {#blank#}2{#/blank#}seven hours a night.

Class is over. Let's {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#}.

Peter is {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} {#blank#}4{#/blank#}.

{#blank#}1{#/blank#} you {#blank#}2{#/blank#} your help. {#blank#}3{#/blank#} {#blank#}4{#/blank#} your help, I have a good day.