Where
What
Who
100
Where does milk come from?
Cows
100
What can we wear on our back?
Backpack
100
Who puts out fires?
Firefighter
200
Where do horses, pigs, and sheep live?
Farm
200
What do bees make (that we can eat)?
Honey
200
Who do we go see when we're sick?
Doctor 
300
Where do we go to buy food?
Store
300
What do dogs like to chew on?
Bones
300
Who teaches kids at school?
Teacher
400
Where do we see a 
In the sky
400
What do we wear on our feet?
400
Who delivers mail?
Mailman or Mailwoman
500
Where do fish live?
In water
500
What does a red light mean?
Stop
500
Who flies an airplane?
Pilot