It is no use __________; he's already overwhelmed with his tasks.

• It is no use যুক্ত incomplete sentence কে complete করার নিয়ম:-
- it is of no use (it’s no use doing something) এর পরে কোনো preposition/ infinitive বা অন্য কিছু বসে না।
- এরপর সরাসরি verb আসে এবং এর সাথে ing যুক্ত হয়।

• সুতরাং, নিয়মানুযায়ী, শূন্যস্থানে সঠিক উত্তরটি হবে - asking for his help
Complete sentence: It is no use asking for his help; he's already overwhelmed with his tasks.

• More examples:
- It's no use crying over spilled milk
- It's no use locking the door now
- It's no use trying again
- It's no use arguing with a drunk.