Using bicycles ______ greatly to people’s physical fitness as well as easing traffic jams.

I hate travelling by air__________ you usually have towait for hours before the plane takes off.

______ important information he left for me!It’s of much ______ to me.

Every year, more than 70,000,000 sharks _______ for their fins(鱼翅).

It is just ____ among countries to host the Olympicsas to win an Olympic medal