-----Do you know where David is ?  I couldn’t find him anywhere.-----Well. He _______have gone far-----his coat’s still here.

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

—Must I go there right now, mum?—No, you ____. You can go there tomorrow.

Teenagers _______ allowed to drive in the street．

You _____ have bought the book for me, but thank you all the same.