Fill in the blanks, each using one of the given words or phrases

Fill in the blanks, each using one of the given words or phrases below in its proper form.
a host of   on the edge of   comply with   short of   end up   be bound up with   stand for   in memory of   give off   at work
There is _________ of reasons why he didn’t get the job.
【正确答案】：a host of