一：根据所给词语的适当形式填空
1：Father ______still ______(sleep) when I____(get) up yesterday morning
2：Doctor Liu was on duty last night.He_____still_____(talk) with his parients in the hospital at 10 PM
3：Mr.Wang spends a lot of time writing his novel every day.He______still____(work)at midnight last night
4：I heard that she was singing just now.(改为同义句）
I heard ____ _____ singing just now
5：当这个飞机起飞的时候这个男孩还在找他的妈妈
When the plane _____ ______,the boy_____ still ______ ______his mother
6对划线部分提问：
While the boy was walking down the street the UFO landed（划线部分为While the boy was walking down the street）
_______ ______ the UFO landed