根据句意和首字母提示补全单词。
1. There is n________ much wrong with you, just have a rest.
2. Lei Feng always helped others in his l________. We should learn from him.
3. —Who can s________ the math problem?
    —I think everybody can.
4. China now p________ enough rice to feed her people every year.
5. In his s________ time, he loves playing the violin and listening to music.
6. Yuan Longping is now working on d________ super hybrid rice.