1, She is the most beautiful girl whose I have ever met

-that

2, She can't speak English,whom is a disadvantage

-which

3, The policeman must try to catch those people whom drive dangerously

-who

4, The person about who I told you yesterday is coming here tomorrow

-∅

5, Mother's Day is the day where children show their love to their mother

-when

6, Do you know the reason when we should learn English?

-why

7, The woman who she told me the news was not a native citizen here

-∅

8, New Year Day is the day where my family members gather and enjoy it together

-when

1, Whose  - > that

2, whom - > which

3, whom -> who

4, about - >∅

5, where - >bwhen

6, When - > Why

7, she ->∅

8, where ->when