1.   Place three of the wider ones on top of each other to form the first tower.

2.   And her plane slammed into the first tower.

3.   And only five minutes after he pulled back into his terminal and ran to find out what had happened, he watched on television as the first tower collapsed.

4.   As the first tower collapsed, he had taken cover under a fire truck.

5.   A spokesman for the Buildings Department said the first Riverside South tower, designated Building C, had the necessary permits to begin.

6.   After the first plane hit the first tower, Mrs. Rivas said, he had called.

7.   George Klein, a principal in Park Tower, said he hoped to start building the first tower in three to five years.

8.   He arrived with the news less than a minute before the first tower fell.

9.   He escaped the collapse of the first tower by ducking inside a nearby firehouse, only to be enveloped by debris from the second tower the moment he emerged.

10.   He was standing on Nassau Street in Manhattan when the first tower collapsed.