Toggle Navigation
Games
Blog
News
Class PIN
Join for Free
Sign in
Toggle Navigation
Games
PIN
Join for Free
Blog
Pricing
News
Contact us
Help center
Sign in
Study
Prefixes
0
%
0
0
0
Back
Restart
paid
prepaid
Oops!
Okay!
agree
disagree
Oops!
Okay!
treat
mistreat
Oops!
Okay!
healthy
unhealthy
Oops!
Okay!
cook
precook
Oops!
Okay!
well
unwell
Oops!
Okay!
spell
misspell
Oops!
Okay!
appear
disappear
Oops!
Okay!
fill
refill
Oops!
Okay!
like
dislike
Oops!
Okay!
school
preschool
Oops!
Okay!
zip
unzip
Oops!
Okay!
heat
reheat
Oops!
Okay!
build
rebuild
Oops!
Okay!
lock
unlock
Oops!
Okay!
Your experience on this site will be improved by allowing cookies.
Allow cookies