1.（1-10）one two three four five six seven eight nine ten .

2.（11-20）eleven twelve thirteen fourteen fifteen eighteen nineteen twenty .

拓展：

(21-30) twenty-one twenty-two twenty-three twenty-four twenty-five twenty-six twenty-seven twenty-eight twenty-nine thirty .

(31-40) thirty-one thirty-two thirty-three thirty-four thirty-five thirty-six thirty-seven thirty-eight thirty-nine forty .

(41-50) forty-one forty-two forty-three forty-four forty-five forty-six forty-seven forty-eight forty-nine fifty