These books are on( )for 30%( ) 意思是:这些书以7折销售

问题描述:

These books are on( )for 30%( ) 意思是:这些书以7折销售
这条裤子穿着合适吗?
( )the pants(

These books are on(sale )for 30%(off )
( Are )the pants( suitable