135.
C is the only correct answer because conditions can improve substantially but not differentially, occasionally or respectively.
Differentially means ‘making hardly any difference (so small is it). It is a word most often used in mathematics.
Occasionally means sometimes or now and then
Respectively means in that order or correspondingly: The male and female inter-views are at 10 and 2 ‘o clock respectively.(The men come at 10 and the women at 2).
136.
A. fill out is correct because after made in the given sentence you need Verb 1: fill out.
B. filling out is incorrect. See A.
C. filled out is not correct as it is the past tense of the verb.
D. to fill out is incorrect because it is the infinitive of the verb and you need Verb 1.
137.
A. in addition is not right because it doesn’t make sense in the sentence.
B. nevertheless also does not make sense.
C. in case of is also nonsense.
D. otherwise is correct because it makes sense. It means the same as’ if not’: If the turbine is not serviced, the equipment will break down.