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Answer
And, but, for, nor, or, so, and yet—these are the seven coordinating conjunctions. To remember all seven, you might want to learn one of these acronyms: FANBOYS, YAFNOBS, or FONYBAS. Coordinating conjunctions connect words, phrases, and clauses.
The answers for this passage can be given(sequentially) as under:-
1. if
(Because it is a conditional statement and hence if should be used)
2. but
("AND" & "BUT" - Often these conjunctions are used to coordinate two independent clauses (groups of words that can stand alone as sentences).
3. if
(Because it is a conditional statement and hence if should be used)
4.who
( Who and sometimes that refer to people. That and which refer to groups or things. So here, who should be used as it is referring to a person.)