一道高中英语题目New ideas sometimes have to wait for years before __

一道高中英语题目New ideas sometimes have to wait for years before __ New ideas sometimes have to wait for years before ( ). New ideas sometimes have to wait for years before they are__ new ideas sometimes have to wait for years before fully acce New ideas have to wait for years before ( ). New ideas sometimes have to wait a long time _B__. Sometimes new ideas have to be tested many times before ____ For years Jones kept--up with new and good ideas.A.to come B __,Mother will wait for him to have dinner We have to wait for 20 minutes ( ) paying the money A.before we have to wait __ hour after hour for the train. Sometimes need to wait for life,but also need patience