Week 2:

ear

hear

year

head

bread

here

there

where

Week 3

her

over

under

bird

first

hurt

nurse

were

Week 4

cow

now

down

our

out

house

you 

your

Week 6 

look

looked

foot

soot

good

wood

put

could

Week 5

air

fair

hair

chair

bear

wear

care

scare