1.   ...the successful penetration by the KGB of the French intelligence service.

2.   The past year has seen a significant increase in our successful penetration of overseas oil and gas markets.

3.   In recent days some claims of successful penetration depth have been stretching the laws of physics.

4.   The successful penetration by the P.R.C. of our nuclear weapons laboratories has taken place over the last several decades, and almost certainly continues to the present.

5.   The attack, which left three Israeli soldiers and their two DFLP attackers dead, was the first successful penetration by militants of an Israeli army outpost.

6.   The attack, in which three Israeli soldiers and their two DFLP attackers were killed, was the first successful penetration by militants of an Israeli army outpost.