Choose the correct alternative in which the words best...

Choose the correct alternative in which the words best complete the gaps in the excerpt below:

“_________________ you elect to base your course on a coursebook, it is ________________ thinking about how you recognize a good one when you see it, and ________________ you might reject or criticize it: _________________, what the main criteria are for coursebook ________________. [...]”

Ur, Penny. A Course in Language Teaching: Practice and Theory. 17.ed. Cambridge University Press, 2009. p. 184.