Jumping out of_________ airplane at ten thousand feet is quite _________ exciting experience.
--- Where does Mr. Smith come from? --- I’m not sure, but his English _______ Australia.
Facts showed that only when they united ______ the strong enemies.
Don’t lose heart. It won’t be long ___________ you catch up with others.
John must have forgotten to return the magazine to the library yesterday, _________?
--- Does _____ of these two buses go to the station? --- You can’t get to the station by __________ of them.