What is the expressioof “mind their p’s and q’s” supposed to mean( )
· To mind their owbusiness.
· To remember to say “please”.
· To remember to say “thank you”.
· To be well-mannered.
出自:华北水利水电大学英语

完成拼图验证

按住下方滑块,将拼图拖到缺口处后松开。

拼图背景,将小拼图拖到缺口处
向右拖动滑块