In America, if ________ friend has invited you to drop by anytime, it is ________ best to call before visiting to make sure it is convenient for him.
I don’t like the way he speaks. He always looks down on others.
Habits are like food we eat every day, which have both positive and negative effect our lives.
For centuries the upper classes in Britain spoke French ______ the common people spoke English.
As a matter of fact, it was the third time that we ______ your school.
--- There's going to be a concert this evening and we want to go there very much. --- The question is ______ we can get a couple of tickets.