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Unit 8 period 2A 略B 1c 2b 3c 4cC 2 second，2nd 3 third，3rd 4 fourth，4th 5 fifth，5th 6 sixth，6th 7 seventh，7th 8 eighth，8th 9 ninth，9th 10 tenth，10th 11 twelfth，12th 12 fifteenth，15th 13 eighteenth，18th14 twentieth，20th 15 twenty-first，21st16 twenty-second，22nd 17 twenty-third，23rdD I the first of June2 the tenth of September3 the thirty-  | 