The door _____ open, no matter how hard she pushes.
A ______of factors led to her decision to resign.
At that time people continued to get _______in horse-drawn vehicles.
I can feel the air _______the sound of children's laughter far from the classroom.
That's all I want to say about this matter. Does anyone have anything else to________?
Judging from her________,she must be from Shandong Province,but I don't know which city.