contains will replace contain because –
The fifth and final act (Main Subject) is in Singular.
Hence, the Verb will also be in Singular as a Verb agrees with its Subject in Number.
Singular Subject® Singular Verb (Main Verb + S)
Plural Subject® Plural Verb (Main Verb without S)
Look at the example given below:
The great poet and scholar is dead.
Here, scholar and poet refer to the same man.
So, the Subject is in Singular and the Verb is also in Singular.
Hence, of Macbeth contains is the right usage.

Correct Option: B

contains will replace contain because –
The fifth and final act (Main Subject) is in Singular.
Hence, the Verb will also be in Singular as a Verb agrees with its Subject in Number.
Singular Subject® Singular Verb (Main Verb + S)
Plural Subject® Plural Verb (Main Verb without S)
Look at the example given below:
The great poet and scholar is dead.
Here, scholar and poet refer to the same man.
So, the Subject is in Singular and the Verb is also in Singular.
Hence, of Macbeth contains is the right usage.

or will replace and because –
either - or,neither-nor are correct forms of Correlative Conjunctions, used for showing the relationship between two things or two terms that are different from each other.
and (Conj.) is used for showing the relationship between two things/situations that exist together.
Look at the examples given below :
Either he could not come or he did not want to. I'm going to buy either a scooter or a motorcycle.
Do it slowly and carefully.
She came in and took her coat off.
Hence, or study for longer period before the examination is the right usage.

Correct Option: C

or will replace and because –
either - or,neither-nor are correct forms of Correlative Conjunctions, used for showing the relationship between two things or two terms that are different from each other.
and (Conj.) is used for showing the relationship between two things/situations that exist together.
Look at the examples given below :
Either he could not come or he did not want to. I'm going to buy either a scooter or a motorcycle.
Do it slowly and carefully.
She came in and took her coat off.
Hence, or study for longer period before the examination is the right usage.

Here, Comparative Degree i.e. is bad, if not worse is the right usage

Correct Option: B

Here, Comparative Degree i.e. is bad, if not worse is the right usage

Here, Though I was tired I had to is the right usage. though (Conj.) : despite the fact

Correct Option: A

Here, Though I was tired I had to is the right usage. though (Conj.) : despite the fact

Here, as far as practicable is the right usage. practicable (Adjective) : feasible ; workable, likely to be successful.

Correct Option: C

Here, as far as practicable is the right usage. practicable (Adjective) : feasible ; workable, likely to be successful.