I want to talk about all these points in ______ order of importance.

单项选择题Not until the 1980’s ______ in Beijing start to find ways to preserve historic buildings from destruction.

单项选择题The scheme for rebuilding the city center（）owing to the refusal of a Council to sanction the expenditure of the money it would have required．

A．fell down
B．fell off
C．fell out
D．fell flat