Many people agree that ______ knowledge of English is a must in _______ international trade today.
However ____ important school life may be, ___ great influence of parents can’t be ignored or discounted by the teacher.
IP addresses are the unique sequence of numbers ______ to each computer, websites or other Internet-connected devices.
— Do you have the time? I’ve got something to tell you.— Ok, ______ you make your story short.
On top of the hill ______, whose style can be traced to the ages of the Roman Empire.
A warning signal suddenly appeared on the screen of my computer, ______ the computer was being attacked by a certain virus.