'Therefore' indicates that his preparation was a result of his studying.

The author shows an understanding attitude, recognizing the concerns of skeptics while advocating for action.

The author views education as critical for raising awareness and fostering informed action on climate change.

The findings are described as groundbreaking, indicating their significant impact on the field.

The context suggests a positive reaction, making 'enthusiasm' the most fitting choice.

In the context of the passage, 'ameliorate' means to improve, making option B the correct replacement.

'Improve' is the best replacement for 'ameliorate', as both words convey the idea of making conditions better.

In the context of the passage, 'mitigate' means to reduce the severity of an issue, making 'reduce' the best replacement.

'Ubiquitous' means present everywhere or widespread, so 'common' is the best replacement in this context.

'Common' is the best replacement for 'ubiquitous', as it conveys the idea of smartphones being widely present in society.

Carrot is a vegetable, while the others are fruits.

Timid is an antonym of the other three words.

'Arduous' means difficult, making option 2 the closest in meaning.

The word 'meticulous' means showing great attention to detail, which is closest in meaning to 'thorough'.

In the context of the passage, 'mitigate' means to reduce the severity of an issue, making 'reduce' the closest synonym.

'Ubiquitous' means present everywhere or widespread, making 'widespread' the closest synonym in meaning.

'Flower' is a homophone for 'flour', sounding the same but having different meanings.

'Happiness' is a noun, while the others are not.

'Under' is the preposition in the sentence.

'Under' is the preposition that shows the relationship between the cat and the table.

'Benevolent' refers to being kind and well-meaning. Hence, the synonym is 'kind'.

'Diligent' means having or showing care and conscientiousness in one's work or duties.

'Frugal' means sparing or economical with regard to money or food.

'Hasty' means done with excessive speed; quick.

'Meticulous' means showing great attention to detail, which is synonymous with 'thorough'.

'Guide' is a synonym for 'navigate'.

'Vigilant' means keeping careful watch for possible danger or difficulties.

'Vivid' means producing powerful feelings or strong, clear images in the mind, which is synonymous with 'bright'.

'Elated' means very happy or proud; therefore, the synonym is 'joyful'.

'Meticulous' means showing great attention to detail, making 'thorough' the correct synonym.