He was a bit nervous. He ____ his breath with a soft sound that was almost heard by the audience.
Nobody believed his reason for being absent from the class __________he had to meet his uncle at the airport.
Shall we go ____ downtown to buy some clothes of high quality?
____ we are alone, we can speak freely.
The chairman thought ____ necessary to invite Professor Smith to speak at the meeting.
It is not expected ____ he said caused so much discussion at the meeting.