11.   As students progress, the demand for American English increases, he said.

n. + progress >>共 362
talk 4.77%
day 4.51%
season 4.42%
game 4.33%
work 3.80%
disease 3.01%
negotiation 2.56%
week 1.59%
case 1.50%
year 1.50%
student 0.97%
student + v. >>共 919
be 10.57%
say 4.47%
have 3.98%
take 2.79%
learn 2.10%
get 1.44%
go 1.25%
do 1.10%
come 1.02%
use 1.02%
progress 0.06%
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