Explanation

She asked him if she could do anything for him.

In indirect speech, "said to" changes to "asked" in yes/no questions.

The pronoun "I" changes to "she," and "can" changes to "could" in reported speech.

Explanation

The larynx is commonly known as the voice box because it houses the vocal cords.

It is responsible for producing sound.

It is located in the throat.

Explanation

Active: We do not waste time.

Passive: Time is not wasted by us.

(Subject becomes the object, and the verb is changed appropriately.)

Explanation

A scalar quantity has only magnitude and no direction.

Examples include mass, time, temperature, and speed.

Explanation

Organizing teaching work ensures structured delivery of content, lesson planning, and effective classroom management.

It lays the foundation for achieving educational goals and student success.

Explanation

ISDN is a set of communication standards for simultaneous digital transmission of voice, video, and data.

It allows faster and more reliable connectivity than traditional analog systems.

Explanation

When comparing how two people speak, use the comparative form "more clearly" with an adverb of more than one syllable.

"Clearly" alone is positive.

Explanation

"Several" refers to an indefinite number, indicating how many mistakes — qualifying it as an Adjective of Number.

It also shows quantity (not exact), so it works as a Quantity Adjective too.

Explanation

The sentence is in simple past tense, so the passive form should be "was sent."

"A parcel was sent by them on Monday" correctly maintains the tense and structure.

Explanation

"Even his opponents admit that he is endowed with rare talents."

• The verb "endowed" is commonly followed by "with" when describing the possession of a particular quality or talent.

• "With" is the correct preposition in this context.