Meaning: 'Unable' means not having the ability to do something, in this case, attend school due to illness.

Wrong options:

• difficult: The word 'difficult' is an adjective that describes something hard to do, but it does not convey the inability to attend school as 'unable' does.
• sick: The word 'sick' describes a state of health but does not indicate the inability to attend school; it is more about the condition rather than the capacity to attend.
• well: The word 'well' indicates a state of good health, which contradicts the context of the son not being able to attend school due to illness.
• painful: The word 'painful' describes a sensation of pain, which does not relate to the ability to attend school and is not contextually appropriate here.
• sorry: The word 'sorry' expresses regret or sympathy but does not fit grammatically as it does not describe the son's ability to attend school.
• previous: The word 'previous' refers to something that came before, which does not fit the context of the son's ability to attend school.

Correct answer: previous

Explanation: The term 'previous' is used to refer to the night before, fitting grammatically and contextually as it indicates a time frame relevant to the son's condition.

Meaning: 'Previous' means occurring before in time, in this case, the night before the current situation.

Wrong options:

• unable: The word 'unable' describes a lack of ability and does not relate to a time frame, making it contextually inappropriate here.
• sick: The word 'sick' describes a health condition and does not indicate a time reference, thus it does not fit in this context.
• well: The word 'well' refers to a state of good health, which does not relate to the timing of events and is not appropriate here.
• painful: The word 'painful' describes a sensation and does not relate to time, making it irrelevant in this context.
• sorry: The word 'sorry' expresses an emotion and does not provide any temporal context, thus it is not suitable here.
• happy: The word 'happy' describes an emotional state and does not relate to the timing of events.

Correct answer: sick

Explanation: The word 'sick' fits grammatically as it describes the son's health condition, which is the reason for his inability to attend school. It aligns with the context of discussing illness.

Meaning: 'Sick' means being unwell or ill, which explains why the son cannot attend school.

Wrong options:

• unable: The word 'unable' describes a lack of ability but does not specifically indicate a health condition, making it less suitable here.
• difficult: The word 'difficult' describes a challenge but does not convey a health condition, thus it does not fit the context of illness.
• well: The word 'well' indicates good health, which contradicts the context of the son being unable to attend school due to being sick.
• painful: The word 'painful' describes a sensation of pain but does not specifically indicate illness, making it contextually inappropriate here.
• sorry: The word 'sorry' expresses sympathy but does not describe a health condition, thus it is not suitable in this context.
• previous: The word 'previous' refers to time and does not relate to the health condition of the son.

Correct answer: well

Explanation: The word 'well' fits grammatically as it describes the desired state of health for the son after rest. It aligns with the context of recovery and future success in exams.

Meaning: 'Well' means in good health, indicating the expected outcome after the son recovers from his illness.

Wrong options:

• sick: The word 'sick' describes a state of illness, which contradicts the desired outcome of recovery and does not fit the context of becoming healthy.
• unable: The word 'unable' describes a lack of ability and does not relate to a state of health, making it inappropriate here.
• painful: The word 'painful' describes discomfort and does not convey a state of good health, thus it is not suitable in this context.
• sorry: The word 'sorry' expresses regret but does not relate to health status, making it contextually irrelevant here.
• previous: The word 'previous' refers to time and does not describe a state of health, thus it is not appropriate here.
• happy: The word 'happy' describes an emotional state rather than a health condition, making it unsuitable in this context.

Correct answer: happy

Explanation: The word 'happy' fits grammatically as it describes the speaker's emotional state regarding helping the son. It aligns with the context of support and positivity.

Meaning: 'Happy' means feeling or showing pleasure or contentment, indicating the speaker's positive feelings about assisting the son.

Wrong options:

• unable: The word 'unable' describes a lack of ability and does not convey an emotional state, making it inappropriate here.
• sick: The word 'sick' describes a health condition and does not relate to the speaker's feelings, thus it is not suitable in this context.
• previous: The word 'previous' refers to time and does not describe an emotional state, making it irrelevant here.
• painful: The word 'painful' describes discomfort and does not convey happiness, thus it is not appropriate in this context.
• sorry: The word 'sorry' expresses regret but does not convey a positive emotional state, making it unsuitable here.
• well: The word 'well' describes a state of health and does not relate to the speaker's feelings, thus it is not appropriate here.