3个月，进入Level 1. 
Archive
For the E1L0 category
A.
one, two, three, four, five, six, seven, eight, nine, ten.
eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen.
twenty, thirty, fourty, fifty, sixty, seventy, eighty, ninety.
hundred, thousand, million, billion.
B.
first, second, third, fourth, fifth, sixth, seventh, eighth, ninth, tenth.
eleventh, twelfth, thirteenth, ..., ninetennth.
twentieth, ..., fortieth,...
C.
January, February, March, April, May, June,
July, August, September, October, November, December.
D
Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday.
E.
Spring, Summer, Autumn/Fall, Winter
