V.        Give the correct forms of the verbs

19. I (never / donate) blood before.                                                                                ________________________

20. We (start) Go Green in 2013.                                                                                   ___________

IV.       Find and correct the mistakes

15. I enjoy to collect dolls and it becomes my pleasure.                                                  ________________________

16. My best friend never enjoys classical music and I don’t too.                                      ________________________

17. My mum finds ice – skate difficult.                                                                          ________________________

18. You shouldn’t drink milk because it is very good for your health.                              ________________________

help

Cho biết x, y là hai đại lượng tỉlệthuận.Điền các sốthích hợp vào các ô trống trong bảng