11.   After a few exhausting months, however, their cover was blown, and they sold the company to Wired.

12.   But my cover was blown.

13.   But my mother will never forgive me if I blow the cover of the National Enquirer.

14.   But what they lack is breeding, and that blows their cover.

15.   But, he adds, their cover was blown when a crew member saw them cleaning their weapons.

16.   Cover blown, the ATF exposed a lot of people, including its own, to lethal force.

17.   For one thing, the book generates a decent degree of suspense over just how Michael will manage to blow his cover.

18.   He blew his cover by putting the wrong end of a cigar in his mouth.

19.   Had he done so, he said, he would have blown his cover.