Explanation-1

Jackson didn’t get the job since he had all the necessary qualifications.

A) No change

B) if

C) unless

D) even though

Explanation-2

The result will be the same whether you attend tomorrow’s meeting or not.

A) No change

B) as soon as

C) whenever

D) once

Explanation-3

She is the best student in school, so she doesn’t do her homework on time.

A) No change

B) as

C) but

D) when

Explanation-4

Let’s go to the concert early but that we can get good seats.

A) No change

B) as

C) or

D) so

Explanation-5

The chef must choose between the Japanese nor French cuisines to prepare for the upcoming inauguration ceremony.

A) No change

B) or

C) then

D) but