How beautifully she sings! I have never heard＿＿＿. 

Keep the camera ________ when you take a picture.

There is a(n) _______ bus service into the center of town, which makes it much easier for farmers to go to sell their vegetables there.

For fear of unemployment, almost one million people sat （参加考试）China civil service examination in order to get  ________jobs.

Five passengers were _____ in the traffic accident and they have all been  taken to the nearest hospital.