1.   The only warning was a low rumbling sound.

2.   I replaced the water heater, but still there are rumbling sounds from the closet.

3.   Instead, the low rumbling sound made it easier for others to notice I was driving such a nerdish vehicle.

4.   One of the fixtures is making a rumbling sound.

5.   They made a rumbling sound, and looked at each other, then back out the door.

6.   Also, people in the area said that a violent rumbling sound preceded the quake, giving them a chance to get out of their homes before they collapsed.

7.   As they came out of their tent, they heard a rumbling sound, and tons of snow crashed down near their camp site.

8.   Concrete worker Ken Strong, who was working on the bleachers, said he heard a loud rumbling sound and turned around to see the collapsed beams.

9.   Construction worker Ken Strong, who was working on the bleachers, said he heard a loud rumbling sound and turned around to see the collapsed beams.

10.   Reports from St. Croix indicated that the tremor shook buildings, swayed plants and trees, and made a rumbling sound.