Mark the letter A, B, C, or D on your answer sheet to indicate the best answer to each of the following questions.

We went on a ___________tour of the city yesterday morning. Every destination was planned carefully.

Choose the best answer to complete each sentence.

Seattle is one of the most ______ cities in the US.

Choose the best answer to complete each sentence.

In Alaska, the ecotourism operators are designed to help minimise tourism ______, which may be more difficult to control as an independent traveler.

Choose the best answer to complete each sentence.

Ecotourism ______  are important to the overall sustainability of the country's tourism industries.

Choose the best answer to complete each sentence.

Texas is ______ to a number of eco-tour companies, and plenty of ranches and resorts.

Choose the best answer to complete each sentence.

Species have               to climate changes throughout history.

Choose the best answer to complete each sentence.

              is holidays and travel that involve causing less damage to the environment than usual and that make people aware of the need to protect the environment.

Choose the best answer to complete each sentence.

First-class _____________ is available on all flights.