reached will replace had reached because –
When two actions take place in the Past, the earlier action is in Past Perfect and the later action in Simple Past Tense.
Look at the example given below :

Correct Option: B

reached will replace had reached because –
When two actions take place in the Past, the earlier action is in Past Perfect and the later action in Simple Past Tense.
Look at the example given below :

for will replace of because –
thirst (for something) (Noun) : a strong desire for something
Thirst agrees with for (Prep.) as in –
athirst for knowledge
Hence, for knowledge is the right usage.

Correct Option: C

for will replace of because –
thirst (for something) (Noun) : a strong desire for something
Thirst agrees with for (Prep.) as in –
athirst for knowledge
Hence, for knowledge is the right usage.

First two will replace two first because –
in Numeral Adjectives – Ordinal and Cardinal Adjectives — a particular order is followed. The order is –

Correct Option: B

First two will replace two first because –
in Numeral Adjectives – Ordinal and Cardinal Adjectives — a particular order is followed. The order is –

to will replace into because –
to (Prep.) indicates in a direction so as to reach
into (Prep.) indicates a position in/inside something
Look at the examples given below :
I’m going with her to Australia.
I went into the yard.
Hence, I went to is the right usage.

Correct Option: A

to will replace into because –
to (Prep.) indicates in a direction so as to reach
into (Prep.) indicates a position in/inside something
Look at the examples given below :
I’m going with her to Australia.
I went into the yard.
Hence, I went to is the right usage.

is he will replace isn’t he because –
The statement is negative and it will use a positive tag.
Look at the examples given below :
It isn’t beautiful, is it ?
They didn’t leave, did they ?
You can do it, can’t you ?

Correct Option: C

is he will replace isn’t he because –
The statement is negative and it will use a positive tag.
Look at the examples given below :
It isn’t beautiful, is it ?
They didn’t leave, did they ?
You can do it, can’t you ?