Aluminum isn’t found free in nature, owing to its always ____ with other elements, most commonly with oxygen. 

（2014届江西省重点中学盟校高三第二次联考英语试卷）25. All the Chinese people are expecting the government’s four-thousand-billion financial plan ______ around the country, ______ to improve the current economic situation.

–Where is Li Ping? –He’s _____ the library.

He had to have the washing machine _________ last night.

Anyway, the crowd around me were obviously enjoying their day out at the races,         by their happy faces and the sense of excitement.