If a person takes drugs, they will slow down his thinking and ________ turn off his brain. 

It was ____ loud music that we couldn’t hear ourselves speak.

It was ________ impossible for her to catch the 9 o’clock train. I know she got up at 9:15．

Mary is very clever and_____ worth teaching , but her brother is not .Look he is now _____ asleep in class.

---It is what parents say and do that really matters in children’s character training. ---______.