Always the old lady ______ sit for hours doing nothing at all.
It's dark, Mum ___ be waiting for my return.
___ the invitation of Mr. Black, she attended the tea-party.
---Is this ___ man that you are looking for? ---Yes, this is ___ the man.
It'll be ten years ___ we have the chance of seeing each other.
--Did you ring him up this morning? ---Yes, but I couldn't ___.