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2a. Work out the rules of forming ordinal numbers合作探究：探究基数词和序数词的变化规律 and fill in the blanks. Then listen, check and repeat.
one first
2 two second
3 three third
four fourth
…
1 one
2 two
3 three
4 four
5 five
6 six
7 seven
8 eight
9 nine
first
second
third
fourth
fifth
sixth
seventh
eighth
ninth
1st
2nd
3rd
4th
5th
6th