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2. fifty → fifties, in his fifties(在他五十多歲時)， in the fifties(在50年代)。

1. three-fifth → three-fifths， 分數表達法是分子用基數詞， 分母用序數詞， 當分子大于1時， 分母應加s。

10. There are about three hundreds people in the park on National Day.

　　 注 釋

9. He wrote a two-thousand-words report.

8. 333 is three hundred thirty-three.

7. People lived a hard life in forties.

6. Hundred of people attended the meeting last night.

5. This big steel plant has a thousand of workers.

4. The sun is 93 millions miles away from the earth.

3. 439 is four hundreds and thirty-nine.