60. Which of the following group all belongs to the same category (范畴)? _____
The chief editor expressed his doubt _______senior people would enjoy reading such magazines .
As your instructor advised ,you ought to spend your time on something ______researching into .
Fancy Williams not ______the answer to such an easy question !
______letting go of a god chance like that ,the silly girl .!
Thes chemical ,_______to kill biological organisms ,are unsafe and oten not specific in their targets .