---Must I leave now?
---No, you ______.
---Would you mind my using your pen?
---______.
---Smith:International Bank Corporation(公司), Good afternoon.
---Watkins:Good afternoon. Mr. Henry Chalmers, please.
---Smith:I'm sorry, sir, ______. We open again at 9:30 on Monday morning.
---Watkins:Thanks. Good-bye.
---Mike:Want to go for a ride in my car?
---Natalie:Of course. ______?
---Mike:Let's go to the country. It's a nice spring day.
---Natalie:That sounds wonderful.
---Must I clean the room right now?
---No, you ______. You ______ clean it after lunch.
---______ I come back before five o'clock?
---No, you ______. But you ______ be back later than seven o'clock.
---Finish drawing a horse in ten minutes. OK?
---Sorry. It ______ in such a short time.
---Polly:Would you like to come over for lunch this Saturday?
---Molly:Oh, ______, but I have an appointment with the doctor. Thank you for inviting me.
---Polly:That's, OK. ______.