1.   They jealously guard their secrets.

2.   Bundles of papers and piles of books guarded secrets from a bygone age.

3.   And he has to overcome the suspicious nature of some artisans who guard their secrets jealously.

4.   And they guard their secrets just as closely.

5.   But he understands why others jealously guard their secret.

6.   But luxury-goods companies guard no secret more ferociously than the cost of making their wares.

7.   For the first three days of his nightmarish captivity, Lalit Verma kept silent, fearfully guarding the secret that he knew would prolong his ordeal.

8.   Guarding its secrets as if they were D-Day invasion plans rather than a bunch of Pizza Hut coupons and an ad for a certain brand of lawn fertilizer.

9.   I forgot that Olympic Ceremony planners guard their secrets like the codes for nuclear war.