第39期N2版 Keys(One possible version)词汇讲解. to conduct an experiment 2. force myself to get 3. force a change 4. cheered; poor people 5. cheer my sister up语法运用. that 2. whose 3. which 4.that 5. when 6. if/ whether 7. where 8. who 9.that 10.who 11.copied 12. did 13. is 14. will have 15. goes 16. if/whether 17. where18. how 19. that 20. when短语聚会 1. cheer; up 2. look on the bright side 3. take up 4. deal with 5. took a break