__________ on Wechat is a common phenomenon, and more people hardly write letters.
—Why not take my car to the museum instead of walking? — No, thanks. ____.
_________ for the free tickets, I would not have gone to the films so often.
I think they failed to accomplish the task, ______?
You might as well expect a river to flow backward ____ us carrying out the plan.
________had the worker who was badly injured in that accident stopped breathing and died________ doctors arrived.