The scientist knows nothing about the matter, because he is always ______ himself in scientific study.

twelve o’clock, I think I must be offnow” “Oh, reallyI ______ it at all”

Most of __________we call geniuses (天才)are successful only because they have made extraordinary efforts

f the creatures in Rowling’s world are not real,and much of____happens is strange．

This kind of workpatience and carefulness.