Hence option B is the correct answer.

The underlined part is grammatically incorrect. The correct phrase to mentioned according to the context of the sentence should be ‘as high as’; ‘as…….as’ is used to make comparisons when the things we are comparing are equal in some way.

Hence, option A is the correct answer.

The underlined part is grammatically incorrect. The correct phrase is ‘many a time’. Thus, replace the underlined part with option A.

Hence, option A is the correct answer.

NOTE: The answer given by SSC was incorrect.

'Enormous' meaning 'extraordinarily large in size, extent, amount, power or degree' is the apt replacement of the underlined segment.

Hence, option C is the correct answer.

The underlined part is grammatically incorrect. With conjunction 'although', we don't need any other conjunction i.e. so. With the singular pronoun 'he', we need a singular verb i.e. 'plans'. Thus, "he plans to get his" is the aptest one. 
Hence, option C is the correct answer.

The underlined part is grammatically incorrect. Preposition 'for' should be used as right/wrong for someone means something is appropriate/inappropriate for someone. Pronoun 'you' (i.e. the person addressed) should be used in place of 'your' (it is the second person possessive pronoun). Preposition 'to' should be used before verb 'do' i.e. infinitive. Also, we need adjective 'bad'. Thus, “for you to do something bad just” is the most appropriate one.

Hence, option A is the correct answer.

The underlined part is grammatically incorrect. The use of the article 'a' before 'special effects' is inappropriate and it should be replaced by the definite article 'the' i.e. 'the special effects' as something specific has been talked about. With the plural noun 'effects', the plural auxiliary verb 'are' should be used. Thus, “because the special effects are” is the most appropriate one.
Hence, option C is the correct answer.

The underlined part is grammatically incorrect. The given sentence is in simple present tense. So, after "don't", verb's base form is necessary. And after preposition 'to', we do need verb's base form i.e. infinitive. Thus, “want to make me blush” is the most suited one.

Hence, option A is the correct answer.

The underlined part is grammatically incorrect. 'Analyses' is the plural form of 'analysis' i.e. when one refers to more than one analysis, we use 'analyses'.
For ex :- After three different scientists completed analyses of the data, the results of the study were ready to be published.
Thus, either it should be 'handwriting analysis was' or handwriting analyses were'.
Among the given options, only option B satisfies the given condition i.e. 'handwriting analysis was one'.

Hence, option B is the correct answer.

The underlined part is grammatically correct.

Hence, option D is the correct answer.