Fill in the blank with the appropriate part: We look forward ____ a response from you.

Complete sentence: We look forward to receiving a response from you.

Look forward to = await eagerly (সানন্দে প্রতীক্ষা করা)। এখানে to হলো preposition, তাই এর পরে verb-এর ing রূপ বসে।

Example: I look forward to meeting you in person.

mind, cannot help, could not help, with a view to ইত্যাদির পরেও verb-এর ing রূপ বসে।