---Excuse me , Sir . But smoking is not allowed here. ---Sorry, I didn’t see the sign. I’ll ___________________ my cigarette at once.

—What are you doing, Uncle Wang?—I am sorting out old books and I’ll        to kids in West China. 

—Look! The wind is blowing strongly.—Yes, we should keep all the windows and doors  ___  .

Tom enjoys ________ stamps in his free time.

With the help of the Internet，news can_______every corner of the world.