You should choose your travel provider on the basis of their eco principles and practices before you go.

A. You are advised to choose your travel provider on the basis of their eco principles and practices before your departure.

B. You are obliged to choose your travel provider on the basis of their eco principles and practices before your departure.

C. You are required to choose your travel provider on the basis of their eco principles and practices before your departure.

D. You have to choose your travel provider on the basis of their eco principles and practices before your departure.

Bài tập Trắc nghiệm Tiếng Anh 10 - Unit 10: Ecotourism (Writing)