—He has two brothers and three sisters. Do you know ________ of them? —No, I know ________ of them.
It makes no difference __________.
They don’t know _______ their parents are.
I am sure _______ you said is true.
The old man told us _______ and ________.
---Do you know when the World Cup ________ next week? --- Next Friday. When it ________, I will ring you.