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

1. three-fifth → three-fifths， 分数表达法是分子用基数词， 分母用序数词， 当分子大于1时， 分母应加s。

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

　　 注 释

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.