tunnels-unit 1

Tunnels provide some of the last available space for cars and trains.

• True

• False

Roman engineers created the tallest buildings.

• True

• False

Roman engineers carved underground chambers.

• True

• False

By the 17th century, ........ were being constructed for canals.

• tunnels

• bridges

• roads

• dams

Engineers investigate ground conditions by ............ soil and rock samples.

• boring

• drilling

• analyzing

• supporting

There are 3 steps to a tunnel's success. They are: excavation, .........., and lining.

• test holes

• support

• tunnel shield

• technique

Mountains .......... be bored by using tunnel boring machines (Possibility).

• must

• can

• should

Tunnels can be divided into three major types:

Soft-ground tunnel; Rock tunnel; and ..........

• Underwater tunnel

• Large tunnel

• Small tunnel

• Prefabricated tunnel

A tunnel shield ......... be used at the head of the tunnel. (Obligation)

• may

• might

• must

• can

Dynamite ......... be used to blast through mountains. (Suggestion)

....ser usado para volar las montañas.

• should

• must

• could