This book ____ 12 units, _____ the unit of Music. 

 Once you are ________ to smoking, it is difficult to give it up.

Teenagers are often treated like _____bigger children, but they are old enough to beindependent.

 — Tell me your secret.   — I ______. It wouldn’t be a secret if I told you.

In China        graduates go abroad to have a further study every year.