Email, as well as letters, ______ an important part in daily communication.
.The room was empty_______ a computer and a desk.
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 .