The two countries signed a___________________to establish a border.

You must wear protective clothing in a construction__________________.

Building a bridge or a dam is a significant__________________of engineering.

Some trains carry passengers, but many transport___________________________instead.

To pay for the construction of the highway, each car had to pay a________________in order to use it.

Ferdinand Magellan is considered to be the first person to____________________the Earth by sailing all around it.

We had to___________________our office to get rid of some insects.

Winter flights may be cancelled due to______________weather conditions

Working full-time and taking care of children can be _______________.

We had a seven-hour_____________, so we decided to look around the city.

Pollution is a__________problem that needs to be addressed.

Years of driving in______________no doubt contributed to Bob's high blood pressure.

The area boasts_________________transportation links.

I believe children should be raised to have an independent____________.

Cycling is an_______________________form of transportation.