B. How can you complete these dialogues? 1) A: Will you stay with us for the weekend? B: ... A: Oh, I'm sorry. I hope your mum will be better soon. 2) A: Did Columbus discover America in 1492 or 1592? B: In 1492, I think, but ... . A: Let's find out. 3) A: Victor speaks English and French, doesn't he? B: I'm ... that he does. 4) A: Is Canada bigger or smaller than the USA? B: ... I don't know geography very well.