A. Words associated with certain animals
A1. A flock of sheep or birds, e.g. geese, pigeons
A2. A herd of cows, deer, goats
A3. A shoal of fish (or any particular fish, e.g. a shoal of herring/ mackerel – singular)
A4. A swarm of insects (typically flying ones, e.g. a swarm of bees/ gnats)
A5. A pack of: can be used for dogs, hyenas, wolves, etc. as well as for (playing) cards.
B. People involved in the same job/ activity
B1. A team of surgeons/ doctors/ experts/ reporters/ scientists/ rescue-workers/ detectives arrived at the scene of the disaster
B2. The crew was/ were saved when the ship sank. (workers on a ship/ ambulance/ plane)
B3. The company is/ are rehearsing a new production. (group of actors)
B4. The cast is/ are all amateurs. (actors in a film or theatre production)
B5. The public has/ have a right to know the truth. (the people as a whole)
B6. The staff are on strike (groups who share a place of work – plural)
C. Things in general
C1. A pair of birds sitting on a branch (two of anything that are the same)
C2. A couple of strawberries (vague way of saying two, not necessary exactly same)
C3. A pile/ heap of papers (or clothes, dishes, toys, etc.)
C4. A bunch of flowers (or grapes, bananas, etc.)
C5. A stack of chairs (or tables, boxes, logs, etc.)
C6. A set of tools (or pots and pans, dishes, etc.)
(Source: English Vocabulary in Use, Cambridge University Press)