Do you know when they______?------_______a winter morning.

Do you know when they______?------_______a winter morning. Do you know what they______(write) on the blackboard now?怎么填 Do you know when to leave tomorrow morning为什么要选to leave不选wil Do you know when (meet) When do you _____ home every morning? when do you get up every morning. Do you know when-----?Next year Do you know when conputers begin?是什么意思 Do you know when my birthday is? do know start you to when do you know ___ when they meet? you,know,was,when,basketball,invented,do