The teacher is much kinder to the top students, ______ makes the others unhappy.
.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.