These children are polite and never speak loudly in class.________.
The doctor insisted that the boy_____seriously ill and that he _____on at once.
—Can you give an example to show how useful a computer is?—Sure. ___________ people get ___________ information from it every day.
Hurry! Class ________. You know the first class _____ at 7:30.
Only when_______ 30 years old ______ to learn English.
All of us know that China has thousands of islands, _____ is Taiwan.