________ is known to us all is that Antarctica is thecoldest place on Earth.

of the good results of the exam, the teacherfelt very happy.

You’d better not ride with your friends in the street. It’s dangerous.

What do you think of Harry, our newclassmate–I am not sure, but he is always asking______ questions.

Snow is rare in this areaYou can hardly see any snow, ________ it is winter