— Did the police ask the guard what happened?— Yes, the guard told the police all _________ he knew.A. which B. that C. what
China has the _____ population in the world.
—David has made great progress recently. —_____, and _____.
Now most families have only one child _____ our country’s one-child policy.
—Can you write the number eighty-five thousand, six hundred and twenty-six? —Yes, it is _____.
This is the most beautiful park I have _____ visited.