--- When shall we meet again?--- Make it _____ day you like, it’s all the same to me.
---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.
His father is __________ engineer and he works __________ research.