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

－We had _______really smoggy December this year.－I can’t remember _____ winter when air was polluted so severely.

This more usage flexibility.

The drive wanted to park his car near the roadside but was asked by the police ________ .

a good view of the scenery in China, Lucywould spend a lot of time on the train _________ travel by air.