-Do you know ______ this i-pad belongs to? - Let me see. Oh, it’s ______.

----How did you get the MP4, from a shop or by phone? ----________. I always like shopping online. 

I find ____ difficult to remember everything, though I’m still young.

— Whose pen is this?  — Oh, it’s_____. I was looking for it everywhere.

--Which would you like, tea or milk?　　--_______________is OK. I really don’t mind.