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.