— Excuse me, is this _________ new camera?                  —Yes, it’s ________.

I think _______ our duty to keep our environment clean and tidy.

--Two tickets to Guilin, please.--Only one ticket left. Would you like _______?

Do you know the girl _______is singing in the classroom?

—How many computers are there in the room?—__________. Some workers moved them to another place just now.