Do you know what things come from trees?

what do you know Do you know what Do you know what? what do you know是什么意思? Do you know ,what's - Do you know what he_____(do) now? If you know what will you do Do you know what I like you do you know what you said what you name Do you know me Do you know what they_______(代表）? Do you know what they are? what’s this( )English?Do you know? do you know what things come from What do you know about Halloween? What do you know about this university? what do you know about the 中文翻译 What do you know about AIDS?