Jerry Lucas, _______ NBA star, used to be _______ university student.
--- It’s difficult for the village children to cross the river for school.--- I think a bridge _______ over the river.
I think the English song is _________ worth _________ again.
---I’ll do the washing-up. Jack, would you please do the floors?--_______.
Give me your telephone number ____I need your help.
---Do you think the last problem in this math test difficult?---Yes. I could work it out.