He is is known as a hacker-he secretly uses or changes the information in other people’s computer system.[ ]

This mountain is about __________.

(2014·宝鸡三检)By the time the girl comes back to life，scientists probably________a cure for this incurable disease

“We give him a book.” The structure (结构) of sentence is .

Air, or _______ is called the atmosphere, surrounds the whole world.