Singular Verb can also be used with neither of.

Correct Option: D

Singular Verb can also be used with neither of.

Here,It is to announce/declare that he has won is the right usage certify : to state officially in writing that something is true.

Correct Option: A

Here,It is to announce/declare that he has won is the right usage certify : to state officially in writing that something is true.

For persons, who/that should be used as Relative Pronoun. Hence, The children who/that are assembled is the right usage.

Correct Option: A

For persons, who/that should be used as Relative Pronoun. Hence, The children who/that are assembled is the right usage.

Here, Gerund i.e. and confidence as dancing is the right usage.

Correct Option: C

Here, Gerund i.e. and confidence as dancing is the right usage.

The sentence is in Past Tense and childlike is the right usage. childlike (Adj.) : having the qualities that children usually have childish (Adj.) : typical of a child ; immature. Hence, they found he had a childlike simplicity is the right usage.

Correct Option: B

The sentence is in Past Tense and childlike is the right usage. childlike (Adj.) : having the qualities that children usually have childish (Adj.) : typical of a child ; immature. Hence, they found he had a childlike simplicity is the right usage.