--- ______ you give your seat to this old man? --- Of course. 

I always go to sleep ___________ the light on. 

— I hear it will rain tomorrow.— It _______ true. You see, there are so many black clouds in the sky now.

 -- Whose French book is it?-- It __________ be Lucy’s. Look! Her name is on the book!

– May I take the magazine out of the reading room?-- No, you can’t. You            read it here. It’s the rule.