Помогите пожалуйста с английским языком!!! Use the Present Perfect Continuous and

Помогите пожалуйста с английским языком!!! Use the Present Perfect Continuous and for or since for each of the following situations. Пример: My friend started reading an interesting book a month ago. He is still reading it. He has been reading the book since last month. c.Viktor began writing a letter to his pen-friend in the U.K.last week and he is still writing it.__________________since last week. d.Omars father started driving his car when he was 20 and he is still driving it._______________since he was 20.