Answer(১):- 1. olx , 2. xookr.in
Answer(২):- www.bikroy.com, www.ekhanei.com, www.bdbazar.com etc are the top classified sites of bangladesh. Also Here we see many ads sites.
Answer(৩):- bikroy.com, ekhane.com, becheden.com
Answer(৪):- Bikroy.com is a website where you can buy and sell almost everything. The best deals are often done with people.
Answer(৫):- www.bikroy.com, www.ekhanei.com. www.ajkerdail.com, www.olx.com, www.bdbazar24.com