Meaning: 'Filtering out' means to remove or separate unwanted elements from a mixture, in this case, toxins from the air.

Wrong options:

• ignoring: Ignoring means to pay no attention to something, which does not apply here as plants actively remove toxins.
• adding: Adding implies increasing the amount of something, which contradicts the idea of removing toxins from the air.
• masking: Masking suggests covering up or concealing something, which does not accurately describe the beneficial action of plants in purifying air.

Correct answer: boosting

Explanation: The word 'boosting' fits well in the context of enhancing productivity and creativity, as it conveys an increase in these levels. Grammatically, it aligns with the present participle form used in the sentence, indicating an ongoing action.

Meaning: 'Boosting' means to increase or improve something, in this case, productivity and creativity levels.

Wrong options:

• lowering: Lowering means to reduce something, which is the opposite of what is intended in this context.
• maintaining: Maintaining implies keeping something at the same level, which does not convey the idea of improvement needed here.
• halting: Halting means to stop something, which does not fit the context of increasing productivity and creativity.

Correct answer: connection

Explanation: The word 'connection' is appropriate as it signifies a bond or relationship, which aligns with the context of enhancing one's relationship with nature. It fits grammatically as a noun that complements the action of caring for plants.

Meaning: 'Connection' refers to a relationship or bond, particularly in this context, the bond between individuals and nature.

Wrong options:

• isolation: Isolation means being separated from others, which contradicts the idea of fostering relationships with nature.
• ignorance: Ignorance implies a lack of knowledge or awareness, which does not relate to the positive engagement with nature described here.
• distraction: Distraction refers to something that diverts attention, which does not align with the concept of building a relationship with nature.

Correct answer: immeasurable

Explanation: The term 'immeasurable' accurately conveys the vast and significant benefits of incorporating plants into daily life, fitting grammatically as an adjective that describes the extent of these benefits. It aligns with the overall positive sentiment of the passage.

Meaning: 'Immeasurable' means that something cannot be measured or quantified, indicating that the benefits of plants are vast and profound.

Wrong options:

• negligible: Negligible means so small or unimportant that it can be disregarded, which contradicts the positive impact described in the text.
• variable: Variable suggests that the benefits can change, which does not capture the consistent positive effects mentioned.
• specific: Specific implies a defined or limited scope, which does not reflect the broad and significant benefits of plants discussed in the passage.