---________ will the foreign students be back from Tianjin?
--- In two days, I think.
--- How many people are there in Changsha?
--- About six ________.
--- Does he ________ with us tomorrow?
--- Certainly.
--- May I eat ________?
--- No, you mustn't eat ________ until you see the doctor.
---Have you ever done ________?
---Yes, I have.