Explanation

They’re going to the party."

وہ پارٹی میں جا رہے ہیں۔

They’re = They are  (contraction)

There = refers to a place or to introduce a sentence (e.g., There is a dog.)

Their = possessive pronoun (e.g., Their car is red.)

Theres =  not a standard word (should be there's = there is)

Explanation

He misses his friend a lot.

"He" is third person singular, so the verb "miss" takes an -es ending in the simple present tense:

miss→misses

Explanation

She was very anxious about her exam results.

"Anxious" fits best because it expresses nervousness or worry

Explanation

I have seen that movie.

The present perfect tense is formed using:

have/has+past participle

Explanation

 "The cat is hiding under the table."

"under" correctly describes the position of the cat beneath the table.

(a) in – means inside something (e.g., in the box)

(b) on – means on top of something (e.g., on the table)

(d) between – used when referring to something in the middle of two objects

Explanation

"He is doing his homework now."

The present continuous tense is formed using:

$$text{am/is/are} + text{verb-ing}$$

Subject "He" takes "is", and the base verb becomes "doing".

Explanation

The past perfect tense is formed using:

had+past participle 

"had finished" →  past perfect

Other options:

(a) I have finished my work. → Present perfect

(b) I finished my work. → Simple past

(d) I was finishing my work. → Past continuous

Explanation

"They are going to the park."

"They" is a subject pronoun used for more than one person.

It correctly matches the verb "are," which is plural.

Why the others would be incorrect (if given):

He → singular (would need "is": He is going…)

Me → object pronoun, not used as the subject

I → singular (would need "am": I am going…)

Explanation

This book is mine.

"mine" is a possessive pronoun that stands alone and replaces a noun.

The other options are incorrect:

my → possessive adjective (needs a noun after it: my book)

me → object pronoun (e.g., Give me the book.)

I → subject pronoun (e.g., I have the book.)

Explanation

Everyone should bring their own lunch.

"Everyone": is a singular pronoun that refers to a group of people.

While grammatically "everyone" is singular, "their" is used as a gender-neutral pronoun to refer to the group.