Mark was afraid of being scolded，so he________say what he thought to his parents.

I think that's unlikely to happen, but if that ______ occur, both America's and China's interest would be severely damaged.

You _________ be punished if you break the school rules. 

— Listen! Helen is singing in the classroom.—It _______ be Helen. She has gone to Shanghai.

—— It's no  easy task to catch a ticket on a website that receives l billion clicks daily．一一I can’t agree with you more．There      be errors for every single step