With the change of the economic foundation the entire immense superstructure is _____ rapidly transformed.
Jumping out of _______ airplane at ten thousand feet is quite _______ exciting experience.
---I think we should buy a car so that it will be convenient for us to go to work. ---______, but do you think we have so much money ?
Everybody went to the party, but Li Hong stayed at home _____ her mother was sick.
We can’t work together any more ; I think it’s time we went our ______ ways.
Noise is unpleasant, _____ when you are trying to sleep.