1.   At that moment no warning bells sounded in his head.

2.   Broomhead heard warning bells starting to ring in his head.

3.   If gas levels get too high, a warning bell will sound.

4.   If the defendant refuses to sign warning bells should ring.

5.   If the engineer does not brake his train, a warning bell is set off, followed by an application of brakes.

6.   Little wonder warning bells were sounding.

7.   No warning bells chimed in this mere mortal mind.

8.   That telephone was sounding a warning bell.

9.   The problems experienced by Elveden Farms, near Thetford, Suffolk, this season should ring warning bells for all beet growers.

10.   There were no more sounds of men running, but his warning bells were ringing.