Answer:
we insist <u>on </u>punctuality in his office.
I hope this helps
This is a predicate adjective, as it immediately follows a copulative (=linking) verb "to grow". If it said - The tall grass, then "tall" would be nominative. This way it isn't, it is a predicative adjective.
I think this is a weak claim because it is comparing electric to gas powered which can’t really be compared
