—Do you think it's a good idea to make friends with your students?—__________,I do. I think it's agreat idea.
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.