Once a computer is put into water, the system _______ and cannot repair itself.

ucy．Do you know where Linda is— She inthe library．I sawher there just a few minutes ago．

There are some police cars in front What do you suppose ____?

There are many computers in the office. Make sure _______the door before you leave.

_________ his membership card,Tim decided to make a phone call to check whether there was something wrong.