---Is this _________backpack? -----No, it isn’t. It’s _________ backpack.
---Are you going to ____________ your friends to your party?---Yes, sure.
---Must I clean the floor now? ---__________. It is too dirty.
---How long may I _____________ the book?---Two weeks.
These aren’t my keys. Mine ___________ in the drawer.
The old man is too tired _________ go any further.