1. It is difficult for us to learn a lesson in life ____we’ve actually had that lesson.
A. until B. after C. since D. when
2. Peter received a letter just now ________ his grandma would come to see him soon.
A．said B．says C．saying D．to say
3. ---Could you turn the TV down a little bit?
---______. Is it disturbing you?
A. Take it easy. B. I’m sorry. C. Not a bit D. It depends
