________you play the violin

Thinking that the students were having an evening class, the teacher left the classroom, _____

It is reported that no problems have been discovered in milk products such as Yili, Sanlu and Mengniu, ________ proves newly-produced liquid milk safe.

Is it only when you fail _________ you will be awareof your mistakes

The boy is ________for his age. —Yes, I was much _______when I was hisage.