than will replace when because –
No sooner – than is the correct Correlative.
No sooner introduces the event that occurred first.
Look at the examples given below :

Correct Option: B

than will replace when because –
No sooner – than is the correct Correlative.
No sooner introduces the event that occurred first.
Look at the examples given below :

feet will replace two legs because –
stand on one’s own feet (Idiom) : to be independent and able to take care of yourself.
Look at the examples given below :
When his parents died, he had to learn to stand on his own feet.
You have to learn to stand on your own feet and not always listen to your friends.

Correct Option: C

feet will replace two legs because –
stand on one’s own feet (Idiom) : to be independent and able to take care of yourself.
Look at the examples given below :
When his parents died, he had to learn to stand on his own feet.
You have to learn to stand on your own feet and not always listen to your friends.

is will replace are because –
when a Plural Noun is placed with a Singular Subject (one, each, etc.) with of, the Verb will be Singular.
Look at the example given below :
Only one of his employees is sincere at work.
Only one of his students is awarded the ‘Scholar award’.
Hence, that is interesting is the right usage.

Correct Option: C

is will replace are because –
when a Plural Noun is placed with a Singular Subject (one, each, etc.) with of, the Verb will be Singular.
Look at the example given below :
Only one of his employees is sincere at work.
Only one of his students is awarded the ‘Scholar award’.
Hence, that is interesting is the right usage.

Use of A is incorrect because –
Uncountable Nouns like milk, wine, information, air, equipment, sand, wood, etc. can’t be counted. Hence, An Indef.Art. will not be used with them.
as in–
Please give me a water. (×)
Please give me some water. ( )
Please give me an ice cube. ( )
Please give me an ice . (×)

Correct Option: A

Use of A is incorrect because –
Uncountable Nouns like milk, wine, information, air, equipment, sand, wood, etc. can’t be counted. Hence, An Indef.Art. will not be used with them.
as in–
Please give me a water. (×)
Please give me some water. ( )
Please give me an ice cube. ( )
Please give me an ice . (×)

abuses will replace cheers because –
a contrast is evident in the sentence.
applause (Noun) : approval expressed, especially by the clapping of hands.
The opposite of applause is abuse
abuse (Noun) : make rude and offensive remarks.
Look at the examples given below :
The audience broke into a loud applause.
Others broke into a loud abuse.
Hence, but some abuses were heard too is the right usage.

Correct Option: C

abuses will replace cheers because –
a contrast is evident in the sentence.
applause (Noun) : approval expressed, especially by the clapping of hands.
The opposite of applause is abuse
abuse (Noun) : make rude and offensive remarks.
Look at the examples given below :
The audience broke into a loud applause.
Others broke into a loud abuse.
Hence, but some abuses were heard too is the right usage.