In my opinion, life in the twenty-first century is much easier than ___________.
—Was ______ Bill, ______ played basketball very well, ______ helped the blind man cross the road?—Yes, of course. He is always ready to help others.
When he was driving home, he was stopped by the policeman and was _______ of speeding.
I don’t know the reason ______ you were absent from the meeting, but I am sure that someone will tell me the reason ______ you haven’t told me.
We often associate the name of Li Ning ______ gymnastics.
______ the cold, thin air and low oxygen levels also can cause mountain sickness.