practise will replace practice because –
practice is a Noun and practise is a Verb.
practice (Noun) : a habit; a repeated exercise
practise (Verb) : to do frequently; carry out an action
Look at the examples given below :
It was his practice to walk five miles every day.
She practises the piano daily.
Hence, had to practise for several hours a day is the right usage

Correct Option: B

practise will replace practice because –
practice is a Noun and practise is a Verb.
practice (Noun) : a habit; a repeated exercise
practise (Verb) : to do frequently; carry out an action
Look at the examples given below :
It was his practice to walk five miles every day.
She practises the piano daily.
Hence, had to practise for several hours a day is the right usage

when will replace than because.
scarcely, hardly, barely are followed by when Look at the examples given below :
We had scarcely sat down at the table, when the phone rang.
The sentence can also be written like this –
Scarcely had we sat down at the table, when the phone rang.
Hence, nervous and tense, when the plane took off is the right usage

Correct Option: B

when will replace than because.
scarcely, hardly, barely are followed by when Look at the examples given below :
We had scarcely sat down at the table, when the phone rang.
The sentence can also be written like this –
Scarcely had we sat down at the table, when the phone rang.
Hence, nervous and tense, when the plane took off is the right usage

between differences will not be used because –
use of distinguish between differences is superfluous.
Here, distinguish (Verb) itself means to recognise the difference between two people or things; differentiate.
Look at the examples given below :
It was hard to distinguish one twin from the other.
It was hard to find the difference between one twin and the other.

Correct Option: B

between differences will not be used because –
use of distinguish between differences is superfluous.
Here, distinguish (Verb) itself means to recognise the difference between two people or things; differentiate.
Look at the examples given below :
It was hard to distinguish one twin from the other.
It was hard to find the difference between one twin and the other.

I like will replace I'm liking because –
like (Verb) is a word used for expressing emotion.
It is not used in Progressive/Continuous form.
Look at the examples given below :
I am liking peanuts. (×)
I like peanuts. ( )
Hence, but I’m liking her a lot is the right usage

Correct Option: C

I like will replace I'm liking because –
like (Verb) is a word used for expressing emotion.
It is not used in Progressive/Continuous form.
Look at the examples given below :
I am liking peanuts. (×)
I like peanuts. ( )
Hence, but I’m liking her a lot is the right usage

had enjoyed will replace enjoyed because –
the basic form in this sentence is as follows :
Look at the examples given below :
I had written the letter before you came home.
I wish I had been brave enough.
Hence, that we had enjoyed very much is the right usage.

Correct Option: B

had enjoyed will replace enjoyed because –
the basic form in this sentence is as follows :
Look at the examples given below :
I had written the letter before you came home.
I wish I had been brave enough.
Hence, that we had enjoyed very much is the right usage.