Explanation

Passive voice of "I am writing a letter" is formed as:

Object + is/are being + past participle + by + subject

So, "A letter is being written by me" is correct.

Explanation

"Idealistic" implies that teachers should embody high moral and ethical standards, serving as role models for students.

Explanation

The Indus Valley is the most important agriculture area of Pakistan.

It has fertile soil and access to river water, making it ideal for farming.

Explanation

Most water in the northern part of the subcontinent comes from Himalayan rivers like the Indus, Ganges, and Brahmaputra.

These rivers are fed by glaciers and snowmelt, ensuring a continuous water supply.

Explanation

7/4 ÷ [77/8 ÷ 30/5 ]

7/4 ÷ [77/8 × 5/30]

= 7/4 ÷ 77/48

= 7/4 × 48/77

= 12/11

Explanation

20% of the 80

=20/100*80

=1/5*80

=1*16

=16

Explanation

“Could” is used to express ability in the past.

The correct sentence is: "He could sing high notes when he was young but his voice has changed."

Explanation

Charming means دلکش

"Charming" is the most fitting adjective to describe a pleasant and delightful weekend in Karachi, as it conveys a sense of warmth and appeal.

Explanation

In this sentence, the structure requires the present tense because the statement is a general truth.

The word "becomes" is the correct form.

Explanation

Factors of 4 = 1, 2, 4

Factors of 6 = 1, 2, 3, 6

Factors of 8 = 1, 2, 4, 8

Highest Common Factor (H.C.F) = 2 (common to all three numbers)