Fill in the Blanks

 We use 'who' for persons, 'which' for non-persons, 'that' for both.

 Which has to be preceded by a comma. Even otherwise, 'that' is a better expression where something is being pointed out. 

Note the difference: This is the house that Gandhi ji was born in.  This is the house in which Gandhi ji was born.  This is the house where Gandhi ji was born. 

 Note that 'which' is not available as an option. Even otherwise, "the only that" is more appropriate.

 The subject is 'we' (who admire) and the object is the 'singer' (whom we admire).

 He has the edge. We use 'who' for subjective case 'he': He who has...

 The subject is 'I' (who wanted) and the object is 'the man' (whom I wanted to meet). 

 The subject is the 'person' (who will not let down) and the object is 'you' (whom he will not let down). 

Here the subject is the committe and the candidates are the object. We use 'whom' for the objective case. 

The plural subject requires plural verb. Plural subject do not take s/es. In the sentence the subject is plural ’some people’ so we use 'do not' and not 'does not'.

The sentence requires subject and verb agreement. The subject ‘one’ is a singular subject, so it requires a singular verb. 'Has' is the correct verb to fill the given blank.

Option 1 is incorrect, as may is used for expressing probability. Option 2 is incorrect, as can is used for expressing ability or permission. Option 3 is correct, as the modal verb must expresses strong necessity to do something. Option 4 is incorrect, as would is used for request or as the past form of will.

The sentence is in past tense as verb ‘came’ has been used, so past progressive tense (was/were + V1 + ing) will be used. Option 1 is incorrect, as it is in present progressive tense. Option 2 is correct, as 'was listening' is correct here. Option 3 is incorrect, as it is in past indefinite tense. Option 4 is incorrect, as it is in present indefinite tense.

The sentence refers to a noun (good advice) in general. Hence, we use indefinite articles a or an. Article a is used before singular nouns beginning with consonant sounds and article an is used before singular nouns beginning with a vowel sound.

Wake somebody up means to make awake. The correct option is 2. Other options are inappropriate.