Rewrite these sentences using collective nouns. Don't forget to change the verb to singular or plural where necessary.

1. There are some tables on top of one another in the next room.
   There is a stack of tables in the next room.
2. There are a large number of people waiting outside.
   
3. The people who work there are very well paid.
   
4. A large number of sheep had escaped from a field.
   
5. She gave me six identical glasses.
   
6. She gave me five or six beautiful roses.