Four phrases/sentences have been removed from the text below. For each question, mark the letter A, B, Cor D on your answer sheet to indicate the correct option that fits each of the numbered blanks.

Tourism and Natural Wonders

People love visiting natural wonders because they are unique and charming. However, the development of tourism can have some negative effects on natural wonders by causing pollution and habitat destruction. First of all, tourists produce waste (37). Secondly, by hiking or climbing natural wonders, (38). This can also damage the homes of small animals. Finally, people often build hotels near natural wonders. This construction can lead to habitat destruction, which causes harm to plants and animals in the area.

Despite these negative effects, we can preserve natural wonders in many ways. Firstly, we can create laws against littering to reduce the amount of waste from tourists. Secondly, we can have laws (39) and not harm nature in any way when they construct buildings near the wonders. Finally, we can raise public awareness of the importance of preserving natural wonders. As a result, (40).

A. which make people respect natural habitats

B. natural wonders will be around for future generations to enjoy

C. which can pollute the air, water and soil around natural wonders

D. tourists may step on small plants and flowers and hurt them

First of all, tourists produce waste (37).