1.   Ian scrutinised the key board closely but was suddenly startled by the shrill sound of the telephone ringing.

2.   Bitter divisions evolved and escalated the shrill sounds of Christian rhetoric.

3.   -- Neighbors often ignore the shrill sound of an alarm.

4.   But then his ears were burning from a shrill sound that signaled denial.

5.   Officers talked loudly most of the night, trying to simulate the frighteningly shrill sounds of prison.

6.   The names blend to form a shrill humming sound.