—Hurry up , or you ________ catch the train. 

--- _____ I use your ruler, Lingling? --- Sure. Here you are.

—Must I finish the paper tonight?    —No, you _______ finish it tomorrow.

--- ____I take the newspaper to the classroom? ---No, you mustn’t. You ______ read it only here.

Sometimes smiles around the world ________ be false, hiding other feelings like anger, fear or worry.