Charities depend _____ people supporting their activities.

• শূন্যস্থানে সঠিক উত্তর হবে - on.
- Complete Sentence: Charities depend on people supporting their activities.

• Depend on/upon someone/something
English Meaning: To trust someone or something and know that that person or thing will help you or do what you want or expect him, her, or it to do.
Bangla Meaning: নির্ভর/অবলম্বন করা; নির্ভরশীল/আশ্রয়ী/মুখাপেক্ষী/সাপেক্ষ হওয়া।

Source: Accessible Dictionary by Bangla Academy.