---Must I finish the exercise this afternoon?
---Yes, you ________, but you ________ finish it now.
---Lucy didn't come to school, did she?
---______.She was ill in bed.
---Can you stay here longer?
---______, but I have to be back tomorrow.
---Let's have a rest, shall we?
---Not now.I don't want to stop ______ the letter yet.
---Mum, I've finished my composition.Would you like me to read it to you?
---Please do.______.
---“Would you like to go for a picnic with us?”
---“______, but I'm too busy.”
---Could you tell me ______?
---By telling them some funny stories.
---We'll have a basketball game tomorrow.
---______.
---Alan, come here.I need your help.
---Sorry, Dad.I ______ the dishes now.
---Is that Mr Li under the tree?
---No, it ______ be him.He’s in the office now.