---Must I hand in my exercise book now, Mr. Zhao?---No, you ______. You may give it to me tomorrow.

 —Did you ask Tom for help?—I ________. —I managed perfectly well on my own.

—We ______ hurry－there’s plenty of time. —So we can have a coffee nearby.

---Who is the tallest boy?        ---It ______  be John. John is of medium height.

--- I can’t find my purse anywhere . --- You ___ have lost it while shopping .