Will you see to _______ that my children are taken good care of while I am away?

“Excuse me, I want to have my watch fixed, but I can’t find a repair shop.” “I know ________ nearby. Come on, I’ll show you.”

Someone is at the door. ________ must be Mr Smith.

Mr Smith is at the door. _______ wants to see you.

I’ve no idea. I just pretended nobody was at home, so I didn’t ask who _______ was.