为下列句子排序。
({#blank#}1{#/blank#}) These are all books about science.
({#blank#}2{#/blank#}) That's a good idea.
({#blank#}3{#/blank#}) Let's put them on this shelf.
({#blank#}4{#/blank#}) We can put them on Shelf B.
({#blank#}5{#/blank#}) Let's make a home library.
