Mark the letter A, B, C, or D to indicate the correct answer to each of the following questions.

Traveling to Ba Mun Island in Quang Ninh, tourists can explore on their own, following some natural _________ on the island.

Suy nghĩ và trả lời câu hỏi trước khi xem đáp án

ATNETWORK
ADMICRO
YOMEDIA
ZUNIA9