词性转换。
1. compete vi . ________ n.; ________ n.; ________ adj.
2. regular adj. ________ adv.
3. athlete n. ________ adj.
4. admit v. ________ n.
5. responsibility n. ________ adj.
6. advertise v. _______ n.
7. foolish adj. _______ n. _______ v.
8. hopeless adj. _______（反义词）; _______ v.; _______ n.
9. pain n. _______ adj.; _______ adv.
10. physical adj. _______ n. _______ n.
1. competition; competitor; competitive 2. regularly 3. athletic
4. admission 5. responsible 6. advertisement 7. fool; fool
8. hopeful; hope; hope 9. painful; painfully 10. physics; physicist