How to complete the sentence using appropriate prepositions?

On - next to

Prepositions are less noticeable and quite tricky part of speech. The relative shortness of the words (most are six letters or under) and their frequently lost part in the general plan of things (for what reason should prepositions be less vital than nouns, adjectives or verbs?) imply that we should treat them deliberately and maybe devote more time to studying them.

In a rundown of English prepositions you will discover extremely common words, for example, 'in', 'up', 'behind', 'from', on next to, and 'with'. Prepositions hold a special position as parts of speech in that they are a 'shut class'. At the end of the day, they are a select gathering of words that don't acknowledge new individuals to their club. This is in contrast to nouns, adjectives and verbs, which welcome new additions to their separate gatherings constantly