Directions: In the following passage some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.

Trees are (1)________ best gift of nature for us. They make the environment beautiful and clean. Water and sunlight are very important to helping trees grow. Human beings get food from trees. Trees also give us wood and shade. Houses, chairs, and toys (2) ________ from wood we receive from trees. Trees can be called the best friends of mankind. Many animals get their food from leaves, vegetables, and fruits grown (3) ________ trees. They also live in the shadows of trees. We (4) ________ cutting trees to save nature. Children and adults need to plant more trees and teach each other to stop causing harm to (5) ________. One tree can save many lives.

Select the most appropriate option to fill in blank number 5.

The correct answer is nature.

Step-by-step Explanation:

1. Analyze the context of the sentence:
The sentence reads: "Children and adults need to plant more trees and teach each other to stop causing harm to (5) ________."

2. Evaluate the options:
- natural (adjective): Relating to nature. Grammatically, we need a noun after the preposition "to".
- nurture (verb/noun): To care for and encourage the growth or development of something. It does not fit the thematic context of protecting the environment.
- nature (noun): The physical world including plants, animals, the landscape, and other features of the earth. The passage emphasizes saving nature ("We ... cutting trees to save nature"). Therefore, "nature" is the correct noun to fill the blank.
- nurturing (present participle/adjective): Caring for. It does not fit grammatically as the object of the preposition in this context.

3. Conclusion:
The noun nature correctly completes the sentence to convey the message that people should stop causing harm to the natural environment.