—Jack, _____ you behave yourself? You're no longer a kid.—Sorry, Daddy.It won't happen again.
Nicolaus Copernicus’ discovery about the universe is ______, which ______later achievements in astronomy science.
We the Chinese are not to be ______, ________the situation is.
People should be cautious ______their personal information when surfing the Internet so as to prevent certain computer viruses ______ it.
The local police were______ by their authorities to _____ the situation as soon as possible.
Only when people have enough to eat and plenty to wear _______ to talk about environmental protection.