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They have to set out for the last train at once, ________?
Students are warned ________ in the exam, otherwise they will be severely punished.
I am wondering ________ you have read “the Harry Potter series” written by JK Rowing.
It is better for you to walk down the stairs instead of ________ the elevator.
He told us that he was tired and thirsty because he ________ in the desert for days.