A good rest between classes ________ recover brain power to its best and make us perform better in class later.

— Can I pay the bill by check?—Sorry, sir. But it is the management rule of our hotel that payment _______ be made in cash.

---Must we donate our pocket money to the poor right now?---No, you _______. You can think it over and do it before Friday.

— You  went to town last month, What  do you think of it?— Terrible . I _____ go there _____.

— _______ we clean the classroom at once?  — No, you _______. You _______ clean it after school.