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The preposition 'by' is used to indicate the standard or unit of measurement, rate, or pricing. 'Cloth is sold by the metre' means the metre is the measuring unit for pricing the cloth. 'By' shows the standard or measure used for selling.

The preposition 'in' is used for larger geographic areas like villages, towns, cities, and countries. When referring to birthplace or origin within a larger geographical boundary, 'in' is the correct preposition. 'He was born in a small village' correctly shows the location within village boundaries.

The preposition 'into' indicates movement from outside to inside a space or container. 'She ran into my room' shows movement entering the room. 'In' indicates static position within, while 'into' shows the action of entering or moving inside something.

The phrase 'with gratitude' is a standard idiomatic expression in English meaning to do something out of thankfulness or appreciation. The preposition 'with' correctly shows the manner or emotion accompanying the action.

'Besides' means 'in addition to' or 'other than.' The sentence means that in addition to Gita, he has three more sisters. Other options like 'In,' 'Into,' 'At,' or 'With' do not convey this meaning of addition.

When expressing the time taken to complete an action, 'in' is the correct preposition. 'In two hours' indicates the duration within which the travelling was completed. 'Into' and 'at' are incorrect for duration, 'since' requires a starting point, and 'with' doesn't fit.

With the present perfect tense ('have not seen'), 'since' is used to indicate the starting point of an action that continues to the present. 'Since last June' means from last June until now. 'In' is for duration, 'into' shows movement, 'at' is for specific times, and 'with' doesn't fit temporal context.

The preposition 'with' is used to indicate the instrument or tool used to perform an action. 'With an axe' means using an axe to cut the tree. 'In' shows location, 'at' shows position, 'by' can show the agent but requires an object after it, and 'on' shows surface.

When referring to a specific time on a clock, 'at' is the correct preposition. 'At five' means at 5 o'clock. 'In' is used for parts of day or longer periods, 'by' means before or not later than, 'with' doesn't indicate time, and 'from' shows starting point.

'Besides' correctly means 'in addition to' or 'along with.' The sentence indicates that curry was served in addition to rice. 'In' and 'into' show containment/entry, 'at' shows location, and 'from' shows origin - none convey addition.

'In' correctly expresses the time duration needed to complete a future action. 'In three hours' means the work will be completed within that time frame. 'But' is a conjunction, 'by' means before a deadline, 'at' is for specific times, and 'from' shows origin.

Since is the correct preposition.

'But' here means 'except' or 'only.' The sentence means 'Only you know the truth' - you are the sole exception to 'nobody.' In, by, at, and from are all prepositions of place, time, or origin that don't convey this meaning of exception.

With present perfect continuous ('has been living'), 'since' indicates the starting point of an action continuing to the present. 'Since 1972' means from 1972 until now. 'In' is for duration, 'into' for movement, 'at' for specific times, and 'from' requires 'to' as a pair.

With present perfect continuous ('has been working'), 'for' indicates the duration or length of time. 'For ten years' means the action has continued for ten years. 'In' is for completion within a time, 'at' for specific times, 'by' for deadlines, and 'from' for starting points.