绝对正确!

　　1st=first

　　2nd=second

　　3rd=third

　　4th=fourth

　　5th=fifth

　　6th=sixth

　　7th=seventh

　　8th=eighth

　　9th=ninth

　　10th=tenth

　　11th=eleventh

　　12th=twelfth

　　13th=thirteenth

　　14th=fourteenth

　　15th=fifteenth

　　16th=sixteenth

　　17th=seventeenth

　　18th=eighteenth

　　19th=nineteenth

　　20th=twentieth

　　21st=twenty-first

　　22nd=twenty-second

　　23rd=twenty-third

　　24th=twenty-fourth

　　25th=twenty-fifth

　　26th=twenty-sixth

　　27th=twenty-seventh

　　28th=twenty-eighth

　　29th=twenty-ninth

　　30th=thirtieth