Explanation

The correct sentence is:

c. She didn't know about the surprise party.

This sentence correctly uses the simple past tense "didn't" with the base form "know."

Explanation

What bothers me is the high cost of the tuition.

Here what means جو

Explanation

The correct form is "Your good gestures will be highly appreciated".

As it uses the passive voice to indicate that the gestures will receive appreciation.

آپ کے اچھے اشاروں کو بہت سراہا جائے گا۔

Explanation

A pun is a form of wordplay
That exploits multiple meanings of a term, or similar-sounding words, for humorous or rhetorical effect.

Explanation

The pronoun "one" must be consistent throughout the sentence.

"One's" is the possessive form matching "one."

Explanation

Exercise is good for health.

ورزش صحت کے لیے اچھا ہے۔

No article

Explanation

The correct preposition to use in this context is "with", as it indicates a connection or association between the subject ("what is wrong") and the person ("him").

"What is wrong with him?"

This means: What is the problem affecting him?

Explanation

I had been working since 2 O’clock.

"Had been working" is past perfect continuous tense.

It is used to show an action that started in the past and continued up to another point in the past.

"Since" is used with a specific point in time (like 2 O’clock).

Explanation

The correct sentence is "Her hair is curly"

Hair" is an uncountable noun and takes a singular verb.

Explanation

"Hello!" is an interjection, not a noun, subject, or preposition.