Explanation

Came back late from the cinema correctly describes returning after leaving the cinema.

It clearly shows movement from a place back to home or another location.

Explanation

On the roadside is the correct phrase for standing beside the road.

Waiting for indicates expecting or looking out for something, like a taxi.

Explanation

Through is used to indicate movement from one side to another within an object.

The correct sentence is “Sand was dripped through a glass container called an hourglass.”

Explanation

To is used when addressing or directing speech toward someone.

The correct sentence is “Speak gently to the aged one.”

Explanation

The correct phrase is “no reward for coming fourth in the race.”

For indicates purpose or reason, in indicates position or place.

Explanation

Towards indicates moving in the direction of something or someone.

It shows intent or direction but does not mean moving inside the crowd.

Explanation

Main sentence: "Anything in this shop can be bought," — positive statement.  

- Question tag must be negative and match the subject/verb.

Subject: we (understood as "we can buy")  

Verb: can → negative form is can't

Explanation

We provided the room with an electric heater.

We use "provided" here because it means to supply or make available something needed or wanted.

Explanation

My car ran out of petrol. 

- "Run out of" means to have no more of something (like petrol).

Explanation

We use "of" in the sentence "Mother was aware of her children" because:

 The word "aware" is usually followed by "of" to show what someone knows or notices.