If _____ green, the door might look more beautiful.

 The gas price keeps rising, ________ an average of 7.7 yuan per liter this month.

　　　 in the east of Asia, China is a developing country with a long history.

 ________  in thought, he almost ran into the car in front of him．   

At the routine office meeting, the headmaster insisted that the problems _________ paid special attention to.