rút gọn: (-a+b)-(b+c+a)+(c-a)

Write the sound /s/ and /∫/ of the underlined letter(s).

      1. celebrate/ /                  6. wish/ /                          11. nice/ /                        16. English/ /

      2.should                      7.special                      12.summer / /               17. wash / /

      3.exciting / /                8.shopping / /               13.sure / /                     18. sugar / /

      4.blossom / /                9.spring / /                   14.class / /                    19. decide / /

            5. show / /        10.shine / /       15.second / /    20.       shirt /