—Who’s singing in the garden?—It _____be Mr. Brown. He always practices singing at this time.A. must B. can’t C. need
---The news he will come back made us _______. ---Come on. We must finish the work and don’t _______.
The book is well worth ______. Everyone ______ buy one and read it.
You have grown up and you should _______ what you have done .
It’s difficult for us to __________ each other because we have spent so much time together .
Smoking ______ in public places in many countries. So you ______ smoke here.