The meeting was long and the speakers said ______nothing worth listening to.
You know, ________ knowledge of ________computer is necessary to a secretary(秘书).
.Did you have trouble_________the entrance to the hill ?
--- What is your hobby , Jack ? --- Collecting stamps . What about you ?---_________.
._________breaks the law should be punished .
Mabel insisted that she_________someone in the next room just now .