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.