---What can I do for you, sir? --- I want _______apple juice and _____apple. A./; an B. an; an C. a; a
—Are you going to help John with his Chinese this evening? —No, He _______ to England. He will be back here next month.
Haze (雾霾)appears around us. Let’s do ________ helpful to protect the environment.
Nancy quickly ________ the door and put down her school things.
So many kinds of sweets! I really can’t decide _______.
Soon you _______ a senior high school student(高中生). Isn’t it exciting?