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1.
a _______ of hay
  clump
  group
  stack
  league
2.
a _______ of pilots
  heap
  set
  crew
  flight
3.
a _______ of tools
  book
  course
  swarm
4.
a _______ of nations
  herd
  colony
  bunch
5.
a _______ of lectures
  range
6.
a _______ of soldiers
  regiment
  fleet
  troupe
  brood
7.
a _______ of wagons
  pack
  train
8.
a _______ of puppies
  budget
  party
  litter
9.
a _______ of roses
  family
  bouquet
  team
10.
an _______ of frogs
  army
  lock
  suite