Пожалуйста помогите с английским, очень срочно нужно, умоляю. Спасибо. 
Choose the right word
1) Is that (your/ yours) pen?
2) That pen is (my/ mine).
3) That ball isn,t (him/his).
4) Is yuor dress as old as (her/ hers)?
5)Their flat is as small as (our/ ours).
6) Our teacher was as (their/ theirs).
p.s. в тексте могут быть ошибки так как писала очень быстро