ch14, 2013, Xi Jinping was elected_______ president of _______People’s Republic of China.

I’ll never forget the day _______ I boughtmy own guitar with my own money.

riving to Beijing after breakfast —Take care,withall this fog

We are now enjoying the cool air in the room.________,the farmers are harvesting crops in the hot sun.[ ]

下列句子中加点虚词的意义和用法相同的一组是（ ）