Пожалуйста помогите выполнить эти упражнения.

since-1,4,6,7,9,12,13,14

for-2,3,5,8,10,11,15

I have known Ben since my childhood

When have you started to work?

-------- since he entered the

------- have changed a lot since the last time

------- hasn"t been at work for week

+

How long have you owned this flat

I have taken part -------

-----------our secretary for several years

+