Fill in the Blanks

Predicting the future is an action, and doer of the action takes pronoun 'who'.

The thing/action that makes him angry is unclear here, and for referring to abstract nouns we use pronoun 'what'.

To refer to a person we use pronoun 'who'.

Here the words 'sort of a man' refers to the nature of the person. And as the nature of a person is an abstract noun, we should use pronoun 'what'.

As it is not clear here that what one is doing, so we should use pronoun 'what'.

Saying something is a verb, and the doer of the action is 'subject' i.e. a person. For a person, we use 'who'.

For referring to persons we use pronoun 'who' (in subjective case) and 'whom' (in objective case). As the doer of the action is 'you' and not the person that qualifies the blank, so for the blank we should use objective case i.e. 'whom'.

Knowing something is a verb (verb of being). For doer of a verb, we use pronoun 'who'.

Whenever we start a sentence with a pronoun referring to more than one person, we use 'which' as the pronoun.

Whenever we refer to profession of a person, we use the pronoun 'what' as an interrogative.

Here the aim of life is an abstract noun, and for abstract nouns we use pronoun 'what'.

For living nouns we use pronoun 'who' (in subjective case) and 'whom' (in objective case). In the given sentence, subject is 'you', and the person he/she met is an objective case. As the blank qualifies to the latter, therefore, option 1.

Case of present indefinite tense. In such cases, we use only the first form of the verb. 'He' being the singular subject takes singular verb. Thus, option 2.

Case of present indefinite tense. In such cases, we use only the first form of the verb. 'My uncle' being the singular subject takes singular verb. Thus, option 2.

Case of present perfect tense. In such cases, we use only the third form of the verb along with auxiliary (has/have). 'I' being the first person takes plural helping verb. 'Yet' qualifies the usage of 'not'. Thus, option 2.