Fill in the blanks with the appropriate transition.
You have to press this button thrice, _________ it won’t work.

The correct answer is: Otherwise

The conjunction 'otherwise' is used to join two clauses in special cases. These special cases work on contradiction which means that the message conveyed in the first clause is antithetical to the one conveyed in the second clause. The use of 'otherwise' in these cases is such that the second clause talks about the consequence that would take place if the action stated in the first clause is not taken. In this case, if the button is not pressed thrice, it would not work.