How difficult math is! I really want to drop it ! —_________you come on，you will do it better．

It was ______the boy said he almost never did any exercise in the school______ the mother began to worry about his health.

New technologies have made ________ possible to turn out new products faster and at a lower cost. [ ]

I was reading attentively in my own room _____ suddenly he knocked at the door[ ]

oned you yesterday morning A girl answered, butI didn’t recognize the voice— Oh, it __________ my younger sister She was in myroom at that moment