A the first blank is on, the second is at, on b the first blank is in (you have a little typo jn the key j is close to I so I'm assuming it's in?*), second is between :)
Formulate and devise. They both mean to create a plan of some sort, while all the other words have to relation to each other. Another trick is to put the words into sentences and see if they deliver the same message.
