.At this moment the bell rang _______ the end of class.　

.He walked down the hills, _______ softly to himself.

I had to shout to make myself _______ above the noise.　

The graduating students are busy _______ material for their reports.

.The cars _______ in Beijing are as good as those _______ in Shanghai.

_______ a satisfactory operation, the patient recovered from illness very quickly.

_______ a satisfactory operation, the doctor believed the patient would recover from his illness very soon.

He wrote a letter to me _______ that his trip to Japan had been put off because of the bad weather.　

He reads newspapers every day to keep himself _______ about what's going on in the world.

— What's wrong with her? Look at her ______ eyes.

— Yes, she must have been ______.