If you _______ in class， you should ________ sorry to your teacher after class.

al-name policy for train tickets has beenapplied to all trains since January 1,2012 in China, ______ I think will makeit easy for people to get tickets

_______ we have planned ahead might change when we putit into practice.

I think you should be about giving your address to strangers. It might be dangerous.[ ]

Sorry indeed. I______ to your birthday party if …—Forget it. I know you were out on business.