Sentence completion

Tomás was struck by the fact that a ________ survived an earthquake while the school next to it collapsed.

Tomás says school collapses are most often caused by ________ rather than poor concrete.

On a project in the Andes, old stone walls were strengthened with ________.

Tomás's team insists that strengthening a school must cost less than ________ of the price of a new one.

In Tomás's designs, the ________ is the strongest part of the school so that it can be used as a shelter.

Many schools now begin earthquake drills with the sound of a ________.

Tomás has found that ________ are often the hardest people to convince.

Tomás's current project is testing base isolators made from ________.