English

The sentence requires a possessive pronoun to indicate whose time will be volunteered. "His" correctly refers to either "my husband" or "my brother," both male, making option A the correct choice.

The correct phrase is 'She could not resist adding a moustache to the photo of his headmaster in the class.' None of the given options (A, B, C) are grammatically correct because they either lack the gerund form 'adding' or are incorrectly capitalized and phrased. Therefore, 'None of these' is the correct choice.

The sentence requires words that fit the context of rejection based on evidence and witnesses. The correct phrase is 'His hypothesis were rejected on the basis of the evidence and witnesses.' Although grammatically 'hypothesis' is singular and the plural form is 'hypotheses,' the option 'hypothesis - basis' is the closest and most appropriate choice given the options. 'Basis' is the correct word to use in this context, meaning 'on the grounds of' or 'because of.' The other options ('Friendly - basis' and 'Hostile - basis') do not fit the context, and 'None of these' is not appropriate since option A is the best fit. The explanation acknowledges the grammatical issue but confirms that option A is the best available answer.

The sentence requires the contraction "It's" (It is) and the word "met" (short for meteorological) or "met department" to indicate the weather department. However, none of the options correctly use the contraction and the correct word together. Option B uses "It's-met" which is not grammatically correct or standard punctuation. Therefore, the best choice is D (None of these).

The correct preposition to use with 'benefited a great deal' is 'from,' as it indicates the source of benefit. Therefore, 'Benefited a great deal from taking that online training course' is correct.

The sentence requires an adjective to describe the nature of the change. 'Gradual' correctly fits the context, indicating that changes happened slowly over time, which aligns with the meaning of the sentence. The other options are either comparative forms that do not fit or irrelevant.

"Elucidate" means to make something clear or explain, which is not a synonym of "Investigate." "Examine" and "Scrutinize" both mean to inspect or investigate carefully, making them synonyms. "None of these" is incorrect because option C is not a synonym.

The word 'Acclaim' means to praise or approve, which is the opposite of 'Offend,' meaning to cause displeasure or hurt feelings. The other options do not represent opposites of 'Offend.'

The plural form 'hypotheses' correctly matches with the plural noun 'bases' to indicate multiple reasons. The phrase 'on the bases of the evidence and witnesses' is the correct idiomatic expression, making option C the correct choice.

The correct preposition to use with 'benefited' in this context is 'from'. The phrase 'benefited from taking that online training course' is grammatically correct and commonly used.