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twenty-one→twenty-first thirty-four→thirty-fourth
若是遇到几十几，只变个位就可以
Work out the rules of forming ordinal numbers and fill in the blanks.
1 one
2 two
3 three
5 five
8 eight
15 fifteen
16 sixteen
20 twenty
21 twenty-one
________
________
third
_________
_________
_________
_________
_________
_________
1st
2nd
3rd
5th
8th
15th
16th
20th
21st