---Answer the doorbell, please. It must be your uncle. ---It __Heidi. She’s coming over this morning to help me with my math.
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.
.At this moment the bell rang _______ the end of class.
The child sat in the dentist's chair _______.