Deriving nouns from verbs

The singer's microphone cut out during his (a)   of the national anthem. (perform)

Many children benefit from doing (a)   word puzzles. (challenge)

Out of the original fifty (a)   , only eight made it to the final interview round. (apply)

The (a)   of three extra names on the list surprised us. (include)

The (a)   went well; all the actors know their lines now, so we're closer to being ready for a performance. (rehearse)

The (a)   of the factory into a school took a year. (transform)

We still haven't recieved any (a)   of the booking. (confirm)

There was (a)   in the classroom regarding the new grammar topic. (confuse)

There's a new (a)   opening at the gallery in town tonight. (exhibit)

The teacher will make an (a)   of the student's current ability before letting him join the class. (evaluate)