scenery will replace sceneries because –
Plural of scenery is scenery.
Hence, The scenery is the right usage

Correct Option: A

scenery will replace sceneries because –
Plural of scenery is scenery.
Hence, The scenery is the right usage

had been will replace has been because –
to show that a comparison is unreal, we use Past Tense with a present meaning after as if/as though.
Look at the examples given below :
She looks as if she were rich.
She talks as if she were mad.
Hence, as if it had been is the right usage.

Correct Option: B

had been will replace has been because –
to show that a comparison is unreal, we use Past Tense with a present meaning after as if/as though.
Look at the examples given below :
She looks as if she were rich.
She talks as if she were mad.
Hence, as if it had been is the right usage.

No error.
Each is used in front of a Singular Noun followed by a Singular Verb.
The use of their (Plural Pronoun) is becoming or common these days.
Look at the examples given below :
Each student has been given his or her own email address.
Each student has been given their own email address.
Each of, each one of and everyone of followed by a Plural Noun/Pronoun take Singular Verb. as in –
Each of the houses is different.

Correct Option: D

No error.
Each is used in front of a Singular Noun followed by a Singular Verb.
The use of their (Plural Pronoun) is becoming or common these days.
Look at the examples given below :
Each student has been given his or her own email address.
Each student has been given their own email address.
Each of, each one of and everyone of followed by a Plural Noun/Pronoun take Singular Verb. as in –
Each of the houses is different.

had already begun will replace was already begun because –
Past Perfect Tense will be used here.
Past Perfect Tense is used for showing an action happened in the Past before another event took place.
Look at the example given below :
By the time I got home yesterday, my mother had already cooked dinner.
Hence, the show had already begun is the right usage.

Correct Option: C

had already begun will replace was already begun because –
Past Perfect Tense will be used here.
Past Perfect Tense is used for showing an action happened in the Past before another event took place.
Look at the example given below :
By the time I got home yesterday, my mother had already cooked dinner.
Hence, the show had already begun is the right usage.

eye will replace eyes.
eye – surgery is the right phrase that should be used.
We can also use ocular – surgery.
ocular : connected with the eyes.
Hence, for the delicate eye-surgery is the right usage.

Correct Option: C

eye will replace eyes.
eye – surgery is the right phrase that should be used.
We can also use ocular – surgery.
ocular : connected with the eyes.
Hence, for the delicate eye-surgery is the right usage.