Meaning: 'May' implies that something is possible or likely to happen.

Wrong options:

• could: 'Could' is also a modal verb indicating possibility, but it suggests a slightly stronger sense of ability rather than the uncertainty implied by 'may.'
• more: 'More' is a comparative adverb that does not fit grammatically or contextually in this sentence.
• attitudes: 'Attitudes' is a noun that does not serve as a verb and does not fit the grammatical structure of the sentence.
• putting it off: 'Putting it off' is a gerund phrase that does not fit as a verb in this context.
• effort: 'Effort' is a noun that does not fit grammatically as it does not serve as a verb in this sentence.
• pulling them: 'Pulling them' is a phrase that does not fit the context or grammatical structure of the sentence.

Correct answer: effort

Explanation: The word 'effort' is a noun that refers to the exertion of physical or mental energy. In this context, it fits perfectly as it describes the level of engagement a student puts into a lesson, which is the focus of the sentence.

Meaning: 'Effort' refers to the physical or mental energy applied to a task.

Wrong options:

• may: 'May' is a modal verb that does not fit as a noun in this context.
• more: 'More' is a comparative adverb that does not fit grammatically or contextually in this sentence.
• attitudes: 'Attitudes' is a noun that does not fit the context of describing the level of engagement in a lesson.
• putting it off: 'Putting it off' is a gerund phrase that does not fit as a noun in this context.
• could: 'Could' is a modal verb that does not fit grammatically as it does not serve as a noun.
• pulling them: 'Pulling them' is a phrase that does not fit the context or grammatical structure of the sentence.

Correct answer: attitudes

Explanation: The word 'attitudes' is a plural noun that refers to the mental and emotional states that influence behavior. In this context, it fits well as it describes the importance of a student's mindset towards revision, which is crucial for effective learning.

Meaning: 'Attitudes' refer to the feelings or opinions about something that affect behavior.

Wrong options:

• may: 'May' is a modal verb that does not fit as a noun in this context.
• more: 'More' is a comparative adverb that does not fit grammatically or contextually in this sentence.
• effort: 'Effort' is a noun that does not encompass the broader concept of mindset and emotional state as 'attitudes' does.
• putting it off: 'Putting it off' is a gerund phrase that does not fit as a noun in this context.
• could: 'Could' is a modal verb that does not fit grammatically as it does not serve as a noun.
• pulling them: 'Pulling them' is a phrase that does not fit the context or grammatical structure of the sentence.

Correct answer: putting it off

Explanation: The phrase 'putting it off' is a gerund phrase that describes the act of delaying or procrastinating. In this context, it fits well as it emphasizes the need for a structured approach to revision to avoid procrastination.

Meaning: 'Putting it off' means to delay or postpone something.

Wrong options:

• may: 'May' is a modal verb that does not fit as a gerund phrase in this context.
• could: 'Could' is a modal verb that does not fit grammatically as it does not serve as a gerund phrase.
• more: 'More' is a comparative adverb that does not fit grammatically or contextually in this sentence.
• effort: 'Effort' is a noun that does not fit as a gerund phrase in this context.
• attitudes: 'Attitudes' is a noun that does not fit the context of describing the act of procrastination.
• pulling them: 'Pulling them' is a phrase that does not fit the context or grammatical structure of the sentence.