Selecting Words Selecting Words - 1

On states or show contact with a thing at rest.
Upon refers to things in motion.
Over refers to a point usually higher than a thing.
Above states to a point directly higher or more higher.

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Innocent means a person who lacks knowledge of evil.
Credulous means disposed to believe on little evidence.

Correct Answer : Credulous

The difference is only that 'upon' is far more formal. You would rarely be incorrect using 'upon' instead of 'on'. The Oxford Dictionary says: Although the word upon has the same meaning as on, it is usually used in more formal contexts or in phrases such as once upon a time and row upon row of seats.

Because arm's length is a idiom which mean to keep away from.

Sentence is in present simple, and with he/she/it/name 's' form of verb is used.

Graceful defines elegance of action.
Gracious defines elegance of spirit.

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In these Question: Meet is the present tense verb and last week tells about the past action. So we add didn't +meet =met is tells about past action.