1.   Down in the drive some one was sounding a car horn.

2.   Suddenly, a car horn sounded from close by.

3.   There was the jabber of a car horn in his ear.

4.   People set off fireworks and tooted their car horns.

5.   Car horns toot as cyclists dart precariously through the traffic.

6.   At that moment there was a squeal of brakes and the angry blowing of a car horn.

7.   It is not permitted to sound a car horn after a certain hour.

8.   As car horns blared, Cuban flags appeared out the windows of many cars, and it appeared that as many drivers were sympathetic to the demonstrators as not.

9.   As a matter of fact, since he arrived in L.A. he has been laying off his car horn.