Explanation

In the last 100 years, the Earth's average temperature has risen by about 1°C due to human activities.

This increase is mainly linked to greenhouse gas emissions.

Explanation

Neuter gender refers to non-living things; knife is an object, so it is neuter.

Mother and wife are feminine (living beings).

Explanation

Enlighten means روشن کریں

Educate means تعلیم دیں

Enlighten means to give someone greater knowledge or understanding, just like educate.

Befog and deceive are opposite in meaning to enlighten.

Explanation

"Told" is used in reported speech when giving instructions or advice, while "said" is typically used for general statements.

"Do" changes to "to do" in the reported speech form.

Explanation

Intelligent describes the quality or characteristic of the students, making it an adjective of quality.

It provides more information about the students' intellectual traits.

Explanation

Quiet means making no noise, which fits the context of a teacher asking students to remain silent.

Quite means to a large extent or degree, which would not make sense in this context.

Explanation

"The Day of Silence" refers to a specific event, making "The" the correct article.

It indicates a particular day that is significant to the context.

Explanation

Biomechanics principles are used to understand the movements of muscles, joints, and bones, focusing on physical forces.

These principles help in analyzing motion and improving performance or preventing injury.

Explanation

The human spine naturally has four curves: cervical, thoracic, lumbar, and sacral.

These curves, along with the intervertebral disks, help to absorb and distribute stress during movement and activities.

Explanation

Tertiary treatment involves filtering, chlorination, and removing salts to further purify wastewater.

It is the final and most advanced stage of wastewater treatment.