分别用①fall down②in fall③fall off④fall asleep⑤as...as possible造句.

fall down:I watch as the book falls down the building.
in fall:The leaves turn red in fall.
fall off:Stay away from the edge,you don't want to fall off that cliff.
fall asleep:I always fall asleep in class.
as..as possible:I'll try to get home as soom as possible.