18.Development of economy ______ which our country attaches great importance, has drawn the attention of the whole world.
________ he is the last man I wanted to see, I did my best to help him.
He tried his best to solve the problem, ________ difficult it was.
Mo Yan was awarded the Nobel Prize for Literature in 2012, ________ made one of the Chinese people’s long-held dreams come true.
The fires burned for three days, ________ a total of 25,000 buildings.
Tom took a taxi to the airport, only ________ his plane high up in the sky.