I came up with a few websites dedicated to different niche markets such as health, travel, house hold items and more. For these sites, I worked to get good back links. I took advantage of CMS and other cheap services to formulate content. However, amongst 15 sites, 10 websites got indexed and are now crawled by Bing. However, the rest 5 websites are not crawled by Bing. And the worst part is that I gave significance to these five sites, and did a lot of SEO. I also checked the Bing webmaster tool, but no information was available. What is the ideal step for me to get these websites indexed?