Because of too many differences between the two sides, a lot of questions are still left ________.A in the air B on the air C by the air D through the air
Lin Xi, a Chinese in Berlin, went to the World Championships in Athleties, she saw China’s Bai Xue win the gold medal.
This middle school is ______ to a teachers' college.
______ good, this kind of fruit ______ very well in our city.
Mary’s being hurt ______ the uncertainty of our winning in the game.
______ to give up smoking, he threw away his ______ cigarettes.