单词拼写。

1. He is a kind teacher and is r_______ by all his students.

2. China produces more crops and e_______ a lot to other countries.

3. F______ is the mother of success.

4. Costs have been r_______ by 20% over the last year to meet the demands.

5. He is often confident and sticks to o_______ the difficulties by himself.

6. The last film he s_______ in was a great success and won him some awards.

7. After hundreds of years' ________ (斗争), the black slaves in the US were set free at last.

8. The mother was ________ (满意的) with her daughter's progress.