Question

Arjun ___ ( participate) in the running competition tomorrow

Answer 1

Heya!
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Here is your answer :-

Arjun WILL PARTICIPATE IN the unhinged competition tomorrow.

WILL PARTICIPATE is the answer and the sentence is in future tense!
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Hope this helps!

Answer 2

heya user
Here is your answer !!

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Question ----->
Arjun ___ ( participate) in the running competition tomorrow .

Answer ----->
Arjun _ WILL PARTICIPATE_ ( participate) in the running competition tomorrow .

___________

hope it helps !!