Didyoucleantheroomlastnight?
lindaareagondgirl.shegetupearlyinthemorning.shewashherfaceandbrushherteeth.thenshehaveherbrekfast.shegotoschoolathalfpastseven.nowiteightthirty.lindaandherclassmatesishaveamathslesson.mrwangiswriteingaquestionontheblackboard.ltsayhowmuchistenplusseven.linda'sanswerareseventy.shemakeamistake.shefeelsorry.错在哪?