It's the first time that he has been to Australia,?
isn't he
hasn't he
isn't it
hasn't it
Mr.Green stood up in defense of the 16-year-old boy,saying that he was not the one___
Failure is never pleasurable,but it can make a positive contribution to your life ___you learn to use it
It is ___to be honest with your children
While waiting for you,I was watching TV in the hall
—Who should be responsible for the accident? —The boss,not the workers.They just carried out the order___