Verbal - GMAT Sentence correction

Verbal - GMAT Sentence correction
Question:-
Option (A)
flames spreading
Option (B)
flame spreads
Option (C)
flames are caused to spread
Option (D)
causing flames to spread
Correct Option:
D
Question Solution:
Tense of sentence before and after "and" should be same. As just before underlined part sentence has word "making", so after "and" also it should have something with "ing"
Option D is only correct answer. Otherwise also none other option is meaningful in this sentence
Question:-
Option (A)
making the construction industry’s economic health much more robust than five years ago
Option (B)
and make the construction industry’s economic health much more robust than five years ago
Option (C)
making the construction industry’s economic health much more robust than it was five years ago
Option (D)
to make the construction industry’s economic health much more robust than five years ago
Correct Option:
C
Question Solution:
Option A is wrong as it is not clear as it is comparing "robust" and five years ago
Option C corrects this mistake by clearly telling the comaparison is between industry now and as it was five years ago
Same problem with sentecne B also
Senctence D is wrong as it can not start with "to"
Question:-
Option (A)
whether the flood was gradual or created a cataclysm
Option (B)
if the flood was gradual or created a cataclysm
Option (C)
about whether the flood was gradual or cataclysmic
Option (D)
whether the flood was gradual or cataclysmic
Correct Option:
D
Question:-
Option (A)
as infrequently as once every other month or often, as
Option (B)
as infrequently as once every other month or as often as
Option (C)
infrequently, as often as once every other month, or often, like
Option (D)
infrequently, like once every other month, or often, like
Correct Option:
B
Question:-
Option (A)
if there is a lack of some other doctor to testify
Option (B)
unless there will be another doctor to testify
Option (C)
without another doctor’s testimony
Option (D)
should there be no testimony from some other doctor
Correct Option:
C
Question:-
Option (A)
beating in unison and adopting
Option (B)
they beat in unison while adopting
Option (C)
beat in unison, and adopt
Option (D)
beating in unison yet adopting
Correct Option:
D