Question

He jumped------the river. preposition

Answer 1

Hola mate!❤❤

Here is the required answer.

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The boy jumped into the river

Explantion for the use of "into"

Rivers are pretty hollow and it is not a flat surface, which explains the use of into. Into is used when something/someone is surrounded by a medium/thing/body.

It can also be,

The boy jumped over the river (this is if the river is small or it is simply a stream)

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Answer 2

Answer:

INTO

Explanation:

A preposition is a word or phrase that is used before a noun or pronoun to show place, time, direction, etc.

Into is a preposition.

INTO is used to express the motion in which something comes inside from outside (which is enclosed).

He jumped into the river.