Identify the missing number in the series: 3, 7, 13, 21, ?

A. 31

What number should come next in the series: 1, 1, 2, 3, 5, 8, ?

D. 13

Piano is to Music as Brush is to ?

A. PAINTING

Bird is to Fly as Fish is to ?

A. SWIM

Teacher is to School as Doctor is to ?

A. HOSPITAL