'A wealthy man' is a concise and clear way to describe him.

'Integrity' fits best as it reflects his moral principles and character.

Using a semicolon improves the sentence structure by connecting two related independent clauses.

'Unanimous' indicates that everyone agreed, which fits the context of a committee decision.

'Innovative' suggests a creative and effective teaching style.

'Cloud nine' is an idiom that means to be extremely happy.

'Aptitude' means a natural ability to do something, which fits the context.

'Lion' is the correct idiom that signifies bravery.

The word 'certain' correctly conveys confidence about her plans.

The correct form is 'had studied' to indicate a past unreal condition.

The past tense 'worked' is correct for the conditional statement.

'Is' is correct because 'flock' is a collective noun treated as singular.

'Are' should be 'is' because 'neither' is singular.

The correct verb should be 'were' because 'students' is plural.

'On time' is the correct idiom to indicate that something was completed as scheduled.

'Submit' is the correct form to use after 'asked'.

'Elated' is a synonym for 'happy' and fits the context of the sentence.

'Quiet' is the appropriate word to indicate the desired behavior during a lecture.

The idiom means to describe exactly what is causing a situation or problem.

'Knack' means a natural skill or talent, fitting the context of the sentence.

'Lazy' is the opposite of 'diligent', which means showing care in one's work.

'Elated' is a synonym for 'happy' and fits the context of the sentence.