Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 27 to 30.

Recognized as a World Heritage Site in Vietnam, Ha Long Bay attracts thousands of visitors every year, who come to enjoy its magnificent natural (27) ____. However, the bay is also facing a number of threats thatmay lead to serious damage to the site. Wildlife in Ha Long Bay is being destroyed by overfishing as this is the only job to support most of the inhabitants here. As a (28) ____, rare sea creatures may become extinct soon.

Another problem is deforestation of mangrove forests. The mangroves, known as the plants native to Ha Long Bay, provide protection during storms, preserve the shoreline, and act as a natural filter that keeps the sea environment clean and healthy. Numerous wildlife species including plants and fish also depend (29) ____ the mangroves.

What is more, some markets in Ha Long Bay sell unusual relics and natural objects, such as coral pieces, sea shells, or unique stones, probably illegally removed from the (30) ____ areas. Many of these items, converted into rings, key chains, and other souvenirs, are purchased by unsuspecting tourists. Buying these items creates a black market leading to further destruction of Ha Long Bay.

As eco-tourists, we can help to protect Ha Long Bay for future generations in several ways. For example, by sailing or fishing with the fishermen, we can share the benefits of tourism with the local community.

Recognized as a World Heritage Site in Vietnam, Ha Long Bay attracts thousands of visitors every year, who come to enjoy its magnificent natural (27) ____.