根据汉语提示完成句子（一共4个）,1.他们正在上课的时候,有人敲门.Theywere-------------whensomebody----------.2.老师进教室的时候你在干什么?Whatwereyoudoing----------------theclassroom?3.看飞机起飞

Question

根据汉语提示完成句子（一共4个）,
1.他们正在上课的时候,有人敲门.
They were ------------- when somebody ----------.
2.老师进教室的时候你在干什么?
What were you doing ---------------- the classroom?
3.看飞机起飞感觉太奇妙了.
lt's ------------------------ take off.
4.那个小镇在一场大火中被烧毁了
That small town was destoryed ----------.
having classes,knock the door
while the teacher was going into
strange to watch flights
by file（感觉不好,但是不知道怎么说）

Answer 1

having class, knocked at the door
when the teacher came into
wonderful to watch planes
in a big fire