This is the correct answer. The preposition 'on' indicates something located in a place or situated close to or alongside a place. In this context, this is correct because the sentence indicates that the students can be residing on the campus (area close to the college) during their vacations.

This is the correct answer. The preposition 'over' indicates something during or throughout a period of time or an occasion. In this context, it is the time period of the last few years.

This is the correct answer. The preposition 'in' indicates a subject or field of activity. In this context, 'in' is used because it refers to the subject matter of the environment.

This is the correct answer. This preposition indicates about or on the subject of, or concerning something. In this context, it refers to your sister's happiness.

The preposition 'among' indicates something that belongs to a particular group or class. In this context, this is correct because the sentence refers to the group of evolutionary theorists.

The preposition adverb 'through' indicates passing from one side or end of something to the other. In this context, this is correct as the light passes through the clouds.

This is the correct answer as the preposition 'for' indicates something intending or intended to benefit somebody or something. In this context, the jail term intended for some rough cops is the correct choice.

The conjunction 'whether' is used to introduce doubt regarding two equal possibilities. In this context, this is correct because there is a doubt if the management will fund the proposed scheme or not.

The conjunction 'so that' is used to indicate something that happens with the result or consequence that something happens. In this context, this is correct as contamination can be avoided as a consequence of removing footwear.

The conjunction 'because' is used to indicate the reason that follows. In this context, this is correct as it refers to the fact that Dolly the sheep was unique as a result of being cloned from an adult cell.

This is the correct answer. The conjunction 'although' is used for granting something or to indicate a situation that takes place in spite of some fact. In this context, it qualifies the dependent clause.

The preposition 'on' is used to indicate something concerned with or relating to a particular subject, thing, or activity. In this context, it refers to the notes that she took concerning each and every case.

This is the correct answer. The preposition 'to' is used with the base form of a verb to indicate the intention or purpose of an action. In this context, it refers to the allusion to some points only.

The preposition 'upon' is used to indicate that an event is imminent. In this context, this is the correct option because the sentence refers to the season of autumn or fall which is imminent.

This is the correct answer. The preposition 'from' is used to indicate the cause of or reason for something.