A. 第1组 1. shade 2. restore 3. identical 4. vacuum 5. literacy 6. stimulate 7. tune-up 8. reinfoce 9. necessity 10. remarkable

B. 第2组 A. the ability to read and write B. a space with nothing at all in it C. slight difference D. exactly alike E. to put back into the original state F. extraordinary G. to encourage something to grow, develop or become active H. something needed I. to make something stronger J. to adjust to improve performance