Explanation

 We use preposition at to describe a position or location seen as a point.

At the end of the lesson.

Explanation

We generally use preposition By before transports like by bus, by car, by air etc. 

Explanation

اس وقت تمام لڑکوں کی وردی گندی ہو چکی تھی

All the sentences other than "option C" are incorrect because the use of apostrophes is inappropriate in "options A and C" and the full stop in "option D" is also of no use.

Explanation

I was wondering if you would be interested in a game of tennis.

میں سوچ رہا تھا کہ کیا آپ ٹینس کے کھیل میں دلچسپی لیں گے۔

"Would" is a modal verb used to express possibility, potential, or invitation.

Explanation

 The cat's toys are in the corner is the correct use of the apostrophe in possessives

possessive noun is singular, add the apostrophe -s. e.g., cat’s toys

the possessive noun is plural and ends with an -s, just add an apostrophe. e.g., cats’ toys

.Note: 

In JUMS key option C is correct  "The cats' toys are in the corner" 

 But According to our view options B & C both are correct

Explanation

The meeting was presided over by the Prime Minister.

The given sentence means the Prime Minister is in charge of the meeting.

'Presided over' is the second form of the phrasal verb 'preside over' which means to be in of something as a meeting or an organization.

So, 'over' is the correct option.

Explanation

Beside & Besides

Beside = side by side

Besides = additional

Beside means بغل میں

Besides means کے علاوہ

Come and sit beside me آو اور میرے قریب/بغل میں بیٹھو

Explanation

We word complain is followed by to/about.

To & about are prepositions here.

Complain to someone کسی انسان سے شکایت کرنا

Complain about something کسی معاملے پر شکایت کرنا

He complained to the principal against me.

Explanation

We generally use a plural verb (were) after some.

Here but is a preposition which means except.

Nothing but some books were available کچھ کتابوں کے علاوہ کچھ بھی دستیاب نہیں تھا

Explanation

quarrel with a person کسی انسان سے جھگڑنا

quarrel over things کسی بات پہ جھگڑنا

Don not quarrel with your neighbours.