PEP·四年级英语下册Let’ssingOh,no!Theclassroomismessy!Let’scleanitup!Ican...Whatcanyoudo?cleantheblackboard黑板/?bl?kb??d/Lookandlearnsweepthefloorputbackthedesksandchairs书桌；办公桌/desk/椅子/t?e?(r)/放回原处Wow!Ourclassroomiscleanandtidy!整洁的；使整洁，整理/?ta?di/Lookand