We should keep the classroom_____________and tidy.
-Excuse me. Could you tell me _________? -Sure. I bought them in a video shop on River Road.
—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 _______.