Question

i saw a squirrel run__the tree the moment it saw a dog​

Answer 1

Answer:

towards.

Explanation:

I think it is towards because we can't write under or behind

Answer 2

I saw a squirrel run up the tree the moment it saw a dog.

• The word used in the blank is a preposition.
• Prepositions are words used before nouns or noun phrases which are used to indicate location, time, position, etc.
• The preposition 'up' is used to indicate position of the noun. It refers to a movement to a higher position, place or degree.
• In other cases, it can also be used as an adverb. For example: Stand up, Speak up, etc.