教程列表：
sea
score
science
save
sausage
sail
safe
sadly
sad
rush
run
round
round
roof
swum
swimmer
sweet
sweet
surprising
surprised
surprise
sure
sunny
summer
sugar
suddenly
such
study
strong
string
slow
asleep
sky
skin
skill
ski
size
single
singer
since
silly
sign
side
sick
shy
shut
show
shower
shout
should
shorts
shine
sharp
shape
several
set
serious
september
send
sell
seem
seed
seat
season
village
yet
yesterday.
wrong
written
writing
writer
worse
worried
world
work
work
word
wood
wonderful
wonder
without
wish
wing
windy
wind
win
wide
whole
while
while
whether
when
what
well
wet
well
weigh
weather
way
way
watermelon
warm
war
wake
waiter
wait
voice
visitor
visit
violin
vegetable
usual
upstairs
unusual
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