planed (past tense of _plane_)
planned (past tense of _plan_)

pleasant
please

precede
proceed }
succeed } these three are the
exceed } "double _e_ group"
concede
intercede
recede
supersede

pre ce dence (act or right of preceding)
prec e dents (things said or done before, now used as authority
or model)

presence (state of being present)
presents (gifts)

prevail
prevalent

principal (chief, leading, the leading official of a school, a
sum of money)
principle (a general truth)

quiet (still)
quite (completely)

rain
reign (rule of a monarch)
rein (part of a harness)

respectfully ("Yours respectfully")
respectively (in a way proper to each--should never be used
to close a letter)

right
rite (ceremony)
write

shone (past tense of _shine_)
shown (past tense of _show_)

seize
siege

sight (view, spectacle)
site (situation, a plot of ground reserved for some use)
cite (to bring forward as evidence)

speak
speech

Spencer, Herbert (scientist)
Spenser, Edmund (poet)

stationary (not moving)
stationery (writing materials)

statue (a sculptured likeness)
stature (height, figure)
statute (a law)

steal (to take by theft)
steel (a variety of iron)

than
then

their (belonging to them)
there (in that place)
they're (they are)

therefor (to that end, for that thing)
therefore (for that reason)

till
until

to
too
two

track (an imprint, or a road)
tract (an area of land)
tract (a treatise on religion)

village
villain

wandering
wondering

weak (not strong)
week (seven days)

weather
whether

whole (entire)
hole (an opening)

who's (who is)
whose (the possessive of _who_)

your (indicates possession)
you're (contraction of _you are_)

Exercise:

1. Insert _to_, _too_, or _two_: He is ---- tired ---- walk the
----miles ---- the town. Then ----, it is ---- late ---- catch
a car. It is ---- minutes of ----. It is ---- bad.

2. Insert _lose_ or _loose_: You will ---- your money if you
carry it ---- in your pocket. We are ----ing time.