The library along with bookstores ________ reading materialsIt’s open from 9?00 amto 4:00pmon weekdays[ ]

下列各句中没有语病的一项是（ ）

Can you come for dinner on Sunday or Saturday—–I’m afraid _______ day is possible

Would you like ______ to drink?

Listen ! Helen is singing in the next room.—It _______ be Helen. She has gone to Beijing.