_____ by the heavy snowfalls, Chenzhou, a city in South China, was cut off from the outside, ________ water and electricity shortage.
.When I came in, I saw Dr. Li _______ a patient.
.The cars _______ in Beijing are as good as those _______ in Shanghai.
The graduating students are busy _______ material for their reports.
I had to shout to make myself _______ above the noise.
.He walked down the hills, _______ softly to himself.