I look forward to ____ from you soon.

The correct answer is - খ) hearing
Full sentence: I look forward to hearing from you soon.

• Use of Look forward:
- Look forward এর পরে 'to' preposition থাকে, তাই এর পর verb এর ing রূপ (V+ing) আসে।

• More Example:
- My friend is looking forward to going to London.
- I am looking forward to seeing you.
- He is looking forward to starting his new job.

এছাড়াও, বাক্যে mind, cannot help, could not help, with a view to, be used to, get used to, worth ইত্যাদির পর কোনো Verb আসলে উক্ত Verb এর সাথে ing যুক্ত হয়।
যেমন:
- He came to Dhaka with a view to visiting a new place.
- Would you mind closing the door?
- I don't mind taking a cup of tea.
- He cannot help laughing out loud.

Source: Applied English Grammar and Composition, P.C. DAS.