题目内容
If you have difficulty_ _ _ _your bills，tell you utility company as soon as possible.
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_ _ _ _most students own a smartphone，the school does not allow them to use it in the classroom.
The airport is usually your first stop before_ _ _ _on your vacation or trip.
He stayed patient and answered every single question，_ _ _ _obvious the answer was.
Generally speaking,you should arrive at the airport with plenty of time_ _ _ _.
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